Acer iconi b1 thermal warning

For hard reset
Follow these steps
1- First turn off your Acer Iconia One 7 B1-730 completely. If you can not unlock the screen, press and hold the power button for about 20 seconds and the phone will turn off.
2- Keep holding on volume down and power keys together for a few seconds. In some devices according to the Android version the combination can be the power key and the volume key up.
3- When the Acer logo is displayed, release the buttons.
4- Move through the menu with the volume up and volume down keys until you reach the "Recovery Mode" option and press the power button to access.

Is the cooling fan working?

what is its ambient temp is it working in daily
temps are way higher inside the casing
if the internal fan has stopped
it will over heat the chips

you can by tablet cooling pads same as laptops

try a cool towel form freezer to rest it on and see if the tablet shuts down

Nextbooks do this when playing intensive games. They just aren't up to the demand on the CPU. Unless you were clearly warned about ths issue I'd say it is a warranty claim. Try to swap it for a games -capable brand.
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Check online specifications:
Acer Iconia Tab B1 710

Acer Iconia Tab B1 710 Specifications

Acer ICONIA B1 710 L480 Specs CNET

Acer ICONIA B1 710 L867

try this,,,settings>storage>apps> demo video> disable

or this,'
Tap on Apps in home screen - Settings - Storage - Internal Storage - Apps - Scroll down and Identify "Demo Video Application" under the apps list .

Tap on Clear Cache and tab on "Disable", Ignore the warning message.
Note: Cust may see the "Demo mode" icon in the homescreen, however it wont bringup Demo Video

Bluetooth

take the battery out and restart the unit

my acer iconia b1-710 displays all pictures and bookjs to negative please help me

You will have to factory reset the unit:
1. Switch off
2. press vol+, hold, then press power
3. If display goes on: Release power but hold vol-up
4. Toggle Lockswitch (On->Off->On->Off)