Lenovo Manual Tab3 8 Ug En V1.0 201604
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Lenovo TAB3 8
User Guide
Lenovo TB3–850F
Lenovo TB3–850M
• All information labeled with * in this guide refers only to the WLAN +
LTE model (Lenovo TB3-850M).
Basics
Before using this information and the product it supports, be sure to read the
following:
Safety, Warranty & Quick Start Guide
Regulatory Notice
"Important safety and handling information" in "Appendix".
The
Safety, Warranty & Quick Start Guide
and the
Regulatory Notice
are
available on the website at http://support.lenovo.com.
Lenovo Companion
Looking for help? The Lenovo Companion app can offer you support for getting
direct access to Lenovo's web assistance and forums*, frequent Q&A*, system
upgrades*, hardware function tests, warranty status checks*, service
requests**, and repair status**.
Note:
* requires data network access.
** is not available in all countries.
You have two ways to get this app:
Search for and download the app from Google Play.
Scan the following QR code with a Lenovo Android device.
Technical specifications
Model Lenovo TB3–850F Lenovo TB3–850M
CPU MTK MT8161P MTK MT8735P
Battery 4290 mAh 4290 mAh
Wireless
communication Bluetooth 4.0; WLAN;
GPS; Bluetooth 4.0; WLAN;
GPS; *LTE/WCDMA/GSM
Note: Lenovo TB3–850M supports LTE Band 1, 3, 7, 8, 20 and 41. But In some
countries, LTE is not supported. To know if your device works with LTE
networks in your country, contact your carrier.
Home screen
The home screen is the starting point for using your device. For your
convenience, the home screen is already set up with some useful apps and
widgets.
Note: Your device features and the home screen may be different
depending on your location, language, carrier, and device model.
You can customize your own home screen at any time.
Home screen
On the first home screen, there is a Google search bar and a Digital
clock widget.
Preview screen
Tap and hold anywhere on the home screen except the icons.
At the bottom of the screen are WALLPAPERS, LOCK SCREEN
WALLPAPER and WIDGETS.
Add a widget to a home screen
Tap at the bottom of the preview screen, tap and hold the widget you
want to add, then drag to where you want to place it and release.
Change the wallpaper
Go to Settings > Display > Wallpaper and choose the wallpaper that
you like.
Tap and hold anywhere on the home screen except the icons, select
WALLPAPERS at the bottom of the screen, and then choose the
wallpaper that you like.
Move an app to another screen
Tap and hold an app that you want to move, drag it to the left or right
side of the screen, then release it where you want to place it.
Uninstall an app
1. Tap , and then tap and hold an app that you want to uninstall.
2. Drag to at the top of the screen until the app turns red, and then
release and tap OK.
Note: Some of the system apps cannot be uninstalled.
Screen buttons
There are four buttons at the bottom of the home screen.
Change the home screen mode button:
Tap change to Media mode.
Tap change to Standard mode.
Tap change to Reading mode.
Tap change to Child mode.
Back button: Tap to return to the previous page.
Home button: Tap to return to the default home screen.
Recent button: Tap to see recent apps. Then you can do the
following:
Tap an app to open it.
Tap an app window icon to lock or to unlock it.
Swipe left or right across the icon to stop the running app.
Tap to stop running all the apps except the locked ones.
Notifications and Quick Settings
Swipe down from the top of the screen to view system notification messages
and quick settings. By tapping on a switch, you can quickly turn a number of
frequently used functions on or off.
Force shutdown
Press and hold the On/Off button for more than 8 seconds until the screen goes
dark.
Camera
To open the Camera app, go to Camera.
Taking photos and videos
You can take photos and record videos with your device's built-in camera.
By swiping on the right side of the screen you can switch between camera,
video, strobo, panorama and memocamera.
Tap to take a photo.
Tap to record a video.
Tap to switch between the front and the back camera.
Tap to turn on the HDR mode.
Tap to turn on the Smile mode.
Tap to turn on the Gestures mode.
Tap to use the Normal mode.
Tap to use the Face beauty mode.
Tap to use the Panorama mode.
Tap to configure the other camera settings.
Taking screenshots
Press and hold the On/Off button and the Volume down button at the same
time.
Viewing pictures and videos
Photos and videos are stored in your device's internal storage. You can view
your photos and videos by using the following methods:
Tap the photo review icon when using the Camera app.
Go to Gallery.
Screenshots are stored in your device's internal storage. You can view your
screenshots by using the following methods:
Go to Gallery.
Network
You need to set up a wireless network before connecting to the Internet.
Set up a WLAN network
*Set up a mobile network
Set up a VPN network
*You can also set up a hotspot to share your mobile network with others.
Setting up a WLAN network
Go to Settings > WLAN.
Turn on the WLAN and tap a WLAN hotspot in the list to connect to the
Internet.
When you access a secure link, you need to enter your login name and
password to connect.
*Setting up a mobile network
Go to Settings > Data usage, you can select SIM1 or SIM2, and then turn on
the Mobile data.
Note: You need a valid SIM card with a data service. If you don't have a SIM
card, contact your carrier.
Setting up a VPN network
VPNs used within organizations allow you to communicate private information
securely over a non-private network. You may need to configure a VPN, for
example, to access your work email. Ask the network’s administrator for the
settings necessary to configure a VPN for your network. When one or more VPN
settings are defined you can:
Note: You need to set a lock screen PIN or password before using VPN. Go to
Settings > Security > Screen lock to select a screen lock option and set up the
screen lock.
Go to Settings > More > VPN.
Tap to edit the VPN profile, including the server name, the type and the
server address, and then tap SAVE.
Tap the VPN server name, input the username and password, and then tap
CONNECT to connect to the VPN network.
Tap and hold the VPN server name to edit or delete the VPN.
*Setting up a hotspot
You can use Personal hotspot to share an Internet connection with a computer
or other device.
Go to Settings > More > Tethering & portable hotspot and do the
following:
Turn on WLAN hotspot.
Tap Set up WLAN hotspot to configure the hotspot.
You can also use Bluetooth tethering and USB tethering.
Note: Tell your friends the Network SSID and password, and then they can
share your mobile network.
Internet
You can browse the web if your device is connected to a wireless network.
To open the browser app, go to Chrome.
Visiting websites
You can use the Chrome app to visit websites.
Type web address
You don't need to type the full web address of an "http://" website to
access it.
To visit "http://www.lenovo.com", simply type "www.lenovo.com" into
the address bar and tap .
Search keywords
You can also type keywords into the address bar to search for webpages.
You can set a search engine in > Settings > Search engine.
Add a new webpage
Tap the blank tab on the top, or tap > New tab to add a new
webpage tab.
Tap > New incognito tab to visit a website without leaving a trace.
Close a webpage
Tap to close a webpage tab.
Refresh a webpage
Tap to refresh a webpage.
Tap to return to the previous webpage.
Tap to go forward to a recent webpage.
Saving webpages
You can save images and webpages in your device's internal storage.
Save images
Tap and hold the image, then tap Save image.
Bookmark webpages
Tap , then tap Save to add a webpage to Bookmarks.
Tap > Bookmarks, to view Mobile bookmarks.
Setting accessibility preferences
Tap > Settings > Accessibility to set the text scaling and the webpage
zoom.
Email
You can receive and send emails if your device is connected to a wireless
network.
To access the Google Email app, go to Gmail.
Setting up an Email account
You can sign into Email if you have an email account. If not, you will need to
create an email account.
You need to set up an email account the first time you use the Gmail app.
Tap Add an email address, select the type of email you want to add, and tap
NEXT. Set up according to the page prompts.
Using Email
After setting up an email account you can use the Gmail app to send and
receive emails.
Maps
You need to select the following settings before you use Maps.
Go to Settings > Location and enable location access for Google apps.
Finding a location
Type the address that you want to find, then tap .
You can also tap , then speak.
Current location
Tap to see your current location.
Then tap Explore around you to check what's nearby.
Planning a route
Tap and type in the "from" and "to" addresses or just keep it as "Your
location".
Choose the travel mode, by car, by bus, or on foot.
Communication
You can use your device to *send a message and manage contacts.
Managing contacts
You can manage contacts with the Contacts app. You can create a contact, and
import and export contacts.
Creating a contact
Go to Contacts.
Tap to add a contact.
Enter the contact information, such as "Name", "Phone", "Email" and so
on.
You can save it in the tablet or SIM card. When you're done, tap .
Importing and exporting contacts
Go to Contacts.
Tap > Import/Export.
Select Import from Internal storage. Choose the vCard files to be
imported, then tap OK.
Or select Export to Internal storage, and tap OK.
*Sending a message
Go to Contacts, choose a name, then tap to write a new message.
Sync
You can transfer data between your device and computer. Transfer music,
pictures, videos, documents, Android application package (APK) files, and so on.
Connecting your device and computer
Connect your device and computer with a data line.
Slide down from the top of the screen, you will see "USB computer
connection" in the notification bar.
Tap USB computer connection for other options.
Selecting computer connection mode
You can select one of the following options
Media device (MTP): Select this mode if you want to transfer media
files such as photos, videos, and ringtones between your tablet and the
computer.
Camera (PTP): Select this mode if you want to transfer only photos
and videos between your tablet and the computer.
Charge only: Select this mode if you want to stop all USB fuction. Let
you speed up USB charging and decrease power consumption.
USB debugging: Select this mode to enable debugging. You can then
use tools such as Idea Tool on the computer to manage your tablet's
data.
Installing APK
Follow these steps:
You need to set the device to allow installation of apps obtained from
unknown sources.
Go to Settings > Security, select Unknown sources and tap OK.
Copy the APK file from the computer to the device in "Media device
(MTP)" mode.
Appendix
Important safety and handling information
To avoid personal injury, property damage, or accidental damage to the product, read
all of the information in this section before using the product. For additional tips to
help you operate your device safely, go to http://www.lenovo.com/safety.
Handle your device with care
Do not drop, bend, or puncture your device; do not insert foreign objects into or
place heavy objects on your device. Sensitive components inside might become
damaged.
Your device screen is made of glass. The glass might break if the device is dropped
on a hard surface, is subjected to a high impact, or is crushed by a heavy object. If
the glass chips or cracks, do not touch the broken glass or attempt to remove it from
the device. Stop using the device immediately and contact Lenovo technical support
for repair, replacement, or disposal information.
When using your device, keep it away from hot or high-voltage environments, such as
electrical appliances, electrical heating equipment, or electrical cooking equipment.
Use your device only in the temperature range of 0°C (32°F) to 40°C (104°F)
(storage -20°C (-4°F) to 60 °C (140°F)) to avoid damage.
Don't expose your device to water, rain, extreme humidity, sweat or other liquids.
Do not disassemble or modify your device
Your device is a sealed unit. There are no end-user serviceable parts inside. All
internal repairs must be done by a Lenovo-authorized repair facility or a Lenovo-
authorized technician. Attempting to open or modify your device will void the
warranty.
Built-in rechargeable battery notice
Do not attempt to replace the internal rechargeable lithium ion battery. There is risk
of explosion if the battery is replaced with an incorrect type. Contact Lenovo Support
for factory replacement.
Plastic bag notice
DANGER:
Plastic bags can be dangerous. Keep plastic bags away from babies and
children to avoid danger of suffocation.
Adapter information
Prevent your device and AC adapter from getting wet.
Do not immerse your device in water or leave your device in a location where it can
come into contact with water or other liquids.
Use approved charging methods only.
You can use any of the following charging methods to safely recharge the internal
battery of your device:
Charging method Display on Display off
AC adapter Supported, but the battery
will charge slowly. Supported
USB connection between
the DC-in connector on the
device and a USB connector
on a personal computer or
other device that complies
with USB 2.0 standards.
The device must be
connected to a USB
interface of USB 2.0 or
higher.
Supported, but will
compensate power
consumption and the
battery will charge more
slowly than usual.
Supported, but the battery
will charge slowly.
Notes:
Display on: Device on
Display off: Device off or in screen lock mode
Charging devices might become warm during normal use. Ensure that you have
adequate ventilation around the charging device. Unplug the charging device if any of
the following occurs:
The charging device has been exposed to rain, liquid, or excessive moisture.
The charging device shows signs of physical damage.
You want to clean the charging device.
Warning:
Lenovo is not responsible for the performance or safety of products not
manufactured or approved by Lenovo. Use only approved Lenovo ac adapters
and batteries.
Prevent hearing damage
Your device has a headphone connector. Always use the headphone connector for
headphones (also called a headset) or earphones.
CAUTION:
Excessive sound pressure from earphones and headphones can cause
hearing loss. Adjustment of the equalizer to maximum increases the
earphone and headphone output voltage and the sound pressure level.
Therefore, to protect your hearing, adjust the equalizer to an appropriate
level.
Excessive use of headphones or earphones for a long period of time at high volume
can be dangerous if the output of the headphone or earphone connectors do not
comply with specifications of EN 50332-2.
The headphone output connector of your device complies with EN 50332-2 Sub clause
7. This specification limits the device's maximum wide band true RMS output voltage
to 150 mV. To help protect against hearing loss, ensure that the headphones or
earphones you use also comply with EN 50332-2 (Clause 7 limits) for a wide band
characteristic voltage of 75 mV. Using headphones that do not comply with EN 50332-
2 can be dangerous due to excessive sound pressure levels.
If your device came with headphones or earphones in the package, as a set, the
combination of the headphones or earphones and the device already complies with
the specifications of EN 50332-1. If different headphones or earphones are used,
ensure that they comply with EN 50332-1 (Clause 6.5 limits). Using headphones that
do not comply with EN 50332-1 can be dangerous due to excessive sound pressure
levels.
Sound pressure warning statement
For devices that are tested in accordance with EN 60950-1:
2006+A11:2009:+A1:2010+A12:2011, it is mandatory to perform audio tests for
EN50332. This device has been tested to comply with the Sound Pressure Level
requirement laid down in the applicable EN 50332-1 and/or EN 50332-2 standards.
Permanent hearing loss may occur if earphones or headphones are used at high
volume for prolonged periods of time.
Warning statement
To prevent possible hearing damage, do not listen at high volume levels for
a long period of time.
Take care when using your device in a motor vehicle or on a bicycle
Always prioritize your safety and the safety of others. Follow the law. Local laws and
regulations might govern how you can use mobile electronic devices, such as your
device, while you drive a motor vehicle or ride a bicycle.
Dispose according to local laws and regulations
When your device reaches the end of its useful life, do not crush, incinerate, immerse
in water, or dispose of your device in any manner contrary to local laws and
regulations. Some internal parts contain substances that can explode, leak, or have
an adverse environmental effects if disposed of incorrectly.
See “Recycling and environmental information” for additional information.
Keep your device and accessories away from small children
Your device contains small parts that can be a choking hazard to small children.
Additionally, the glass screen can break or crack if dropped on or thrown against a
hard surface.
Protect your data and software
Do not delete unknown files or change the name of files or directories that were not
created by you; otherwise, your device software might fail to work.
Be aware that accessing network resources can leave your device vulnerable to
computer viruses, hackers, spyware, and other malicious activities that might damage
your device, software, or data. It is your responsibility to ensure that you have
adequate protection in the form of firewalls, antivirus software, and anti-spyware
software and keep such software up to date.
Keep electrical appliances away from your device. These include electric fans, radios,
high-powered speakers, air-conditioners, and microwave ovens. The strong magnetic
fields generated by electrical appliances can damage the screen and the data on the
device.
Be aware of heat generated by your device
When your device is turned on or the battery is charging, some parts might become
hot. The temperature that they reach depends on the amount of system activity and
the battery charge level. Extended contact with your body, even through clothing,
could cause discomfort or even a skin burn. Avoid keeping your hands, your lap, or
any other part of your body in contact with a hot section of the device for any
extended time.
Electronic emission notices
FCC Compliance Statement
This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses, and can radiate radio frequency energy
and, if not installed and used in accordance with the instructions, may cause harmful
interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause
harmful interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which
the receiver is connected.
Consult an authorized dealer or service representative for help.
Lenovo is not responsible for any radio or television interference caused by
unauthorized changes or modifications to this equipment. Unauthorized changes or
modifications could void the user’s authority to operate the equipment.
This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions: (1) this device may not cause harmful interference, and (2)
this device must accept any interference received, including interference that may
cause undesired operation.
Responsible Party:
Lenovo (United States) Incorporated
1009 Think Place - Building One
Morrisville, NC 27560
Telephone: 1-919-294-5900
IC Caution
This device complies with Industry Canada license-exempt RSS standard(s). Operation
is subject to the following two conditions:
(1) This device may not cause interference, and
(2) this device must accept any interference, including interference that may cause
undesired operation of the device.
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux
appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions
suivantes:
(1) l'appareil ne doit pas produire de brouillage, et
(2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même
si le brouillage est susceptible d'en
European Union-Compliance to the Electromagnetic Compatibility Directive
This product is in conformity with the protection requirements of EU Council Directive
2004/108/EC on the approximation of the laws of the Member States relating to
electromagnetic compatibility. Lenovo cannot accept responsibility for any failure to
satisfy the protection requirements resulting from a nonrecommended modification of
the product, including the installation of option cards from other manufacturers.
This product has been tested and found to comply with the limits for Class B
Information Technology Equipment according to European Standard EN 55022. The
limits for Class B equipment were derived for typical residential environments to
provide reasonable protection against interference with licensed communication
devices.
EU contact: Lenovo, Einsteinova 21, 851 01 Bratislava, Slovakia
German Class B compliance statement
Deutschsprachiger EU Hinweis:
Hinweis für Geräte der Klasse B EU-Richtlinie zur Elektromagnetischen Verträglichkeit
Dieses Produkt entspricht den Schutzanforderungen der EU-Richtlinie 2004/108/EG
(früher 89/336/EWG) zur Angleichung der Rechtsvorschriften über die
elektromagnetische Verträglichkeit in den EU-Mitgliedsstaaten und hält die
Grenzwerte der EN 55022 Klasse B ein. Um dieses sicherzustellen, sind die Geräte wie
in den Handbüchern beschrieben zu installieren und zu betreiben. Des Weiteren
dürfen auch nur von der Lenovo empfohlene Kabel angeschlossen werden. Lenovo
übernimmt keine Verantwortung für die Einhaltung der Schutzanforderungen, wenn
das Produkt ohne Zustimmung der Lenovo verändert bzw. wenn
Erweiterungskomponenten von Fremdherstellern ohne Empfehlung der Lenovo
gesteckt/eingebaut werden.
Deutschland:
Einhaltung des Gesetzes über die elektromagnetische Verträglichkeit von
Betriebsmitteln Dieses Produkt entspricht dem „Gesetz über die elektromagnetische
Verträglichkeit von Betriebsmitteln“ EMVG (früher „Gesetz über die
elektromagnetische Verträglichkeit von Geräten“). Dies ist die Umsetzung der EU-
Richtlinie 2004/108/EG (früher 89/336/EWG) in der Bundesrepublik Deutschland.
Zulassungsbescheinigung laut dem Deutschen Gesetz über die elektromagnetische
Verträglichkeit von Betriebsmitteln, EMVG vom 20. Juli 2007 (früher Gesetz über die
elektromagnetische Verträglichkeit von Geräten), bzw. der EMV EG Richtlinie
2004/108/EC (früher 89/336/EWG), für Geräte der Klasse B.
Dieses Gerät ist berechtigt, in Übereinstimmung mit dem Deutschen EMVG das EG-
Konformitätszeichen - CE - zu führen. Verantwortlich für die Konformitätserklärung
nach Paragraf 5 des EMVG ist die Lenovo (Deutschland) GmbH, Meitnerstr. 9, D-
70563 Stuttgart.
Informationen in Hinsicht EMVG Paragraf 4 Abs. (1) 4:
Das Gerät erfüllt die Schutzanforderungen nach EN 55024 und EN 55022 Klasse B.
Korea Class B compliance statement
B급 기기(가정용 방송통신기자재)
이 기기는 가정용(B급)전자파적합기기로서 주로 가정에서 사용하는
것을 목적으로 하며 모든 지역에서 사용할 수 있습니다.
Japanese VCCI Class B statement
この装置は、クラスB情報技術装置です。この装置は、家庭環境で使用することを目的とし
ていますが、この装置がラジオやテレビジョン受信機に近接して使用されると、受信障害を
引き起こすことがあります。 取扱説明書に従って正しい取り扱いをして下さい。VCCI-B
Japan compliance statement for products that connect to power mains rated at
less than or equal to 20A per phase
日本の定格電流が
20A/
相
以下の
機
器に対する
高
調波電流
規
制
高
調波電流
規
格
JIS C 61000-3-2
適合品
Environmental, recycling, and disposal information
General recycling statement
Lenovo encourages owners of information technology (IT) equipment to responsibly
recycle their equipment when it is no longer needed. Lenovo offers a variety of
programs and services to assist equipment owners in recycling their IT products. For
information on recycling Lenovo products, go to http://www.lenovo.com/recycling.
Important battery and WEEE information
Batteries and electrical and electronic equipment marked with the symbol of a
crossed-out wheeled bin may not be disposed as unsorted municipal waste. Batteries
and waste of electrical and electronic equipment (WEEE) shall be treated separately
using the collection framework available to customers for the return, recycling, and
treatment of batteries and WEEE. When possible, remove and isolate batteries from
WEEE prior to placing WEEE in the waste collection stream. Batteries are to be
collected separately using the framework available for the return, recycling, and
treatment of batteries and accumulators.
Country-specific information is available at http://www.lenovo.com/recycling.
Battery recycling information for Brazil
Declarações de Reciclagem no Brasil
Descarte de um Produto Lenovo Fora de Uso Equipamentos elétricos e eletrônicos
não devem ser descartados em lixo comum, mas enviados à pontos de coleta,
autorizados pelo fabricante do produto para que sejam encaminhados e processados
por empresas especializadas no manuseio de resíduos industriais, devidamente
certificadas pelos orgãos ambientais, de acordo com a legislação local. A Lenovo
possui um canal específico para auxiliá-lo no descarte desses produtos. Caso você
possua um produto Lenovo em situação de descarte, ligue para o nosso SAC ou
encaminhe um e-mail para: reciclar@lenovo.com, informando o modelo, número de
série e cidade, a fim de enviarmos as instruções para o correto descarte do seu
produto Lenovo.
Recycling information for Japan
Recycling and disposal information for Japan is available at
http://www.lenovo.com/recycling/japan.
Recycling information for India
Recycling and disposal information for India is available at
http://www.lenovo.com/social_responsibility/us/en/sustainability/ptb_india.html.
Battery recycling marks
The battery recycling information of Taiwan
Battery recycling information for the United States and Canada
Battery recycling information for the European Union
ENERGY STAR model information
ENERGY STAR® is a joint program of the U.S. Environmental Protection Agency and
the U.S. Department of Energy aimed at saving money and protecting the
environment through energy efficient products and practices.
Lenovo is proud to offer our customers products with the ENERGY STAR qualified
designation. Lenovo TB3-850F has been designed and tested to conform to the
ENERGY STAR program requirements for computers.
By using ENERGY STAR qualified products and taking advantage of the power
management features of your computer, you can help reduce the consumption of
electricity. Reduced electrical consumption can contribute to potential financial
savings, a cleaner environment, and the reduction of greenhouse gas emissions.
For more information about ENERGY STAR, go to http://www.energystar.gov.
Export classification notice
This product is subject to the United States Export Administration Regulations (EAR)
and has an Export Classification Control Number (ECCN) of 5A992.c. It can be re-
exported except to any of the embargoed countries in the EAR E1 country list.
Troubleshooting
Insufficient memory prompt appears during app installation
Please free up some memory and try to install again.
The touch screen does not work or is not sensitive
Please hold down the On/Off button for more than 8 seconds until the device turns
off. Then switch it on again in normal way.
Device does not power on or system crashes
Please charge the battery for half an hour and then hold down the On/Off button for
more than 8 seconds until the device turns off. Then switch it on again in normal
way.
There is no sound or the other person cannot hear during a call.
Please adjust the volume using the volume button.
The device cannot access the internet via wireless network
Restart the wireless router or go to Settings and restart WLAN.
The device cannot wake up from sleep mode
Please hold down the On/Off button for more than 8 seconds until the device turns
off. Then switch it on again in normal way.
