Oppo AX5 android 8.1 how to turn off screen overlay

Hope this help.
1. From your home page go to Main Settings by pulling down the Notification Bar and clicking on the Settings icon at the top right of the screen. (it's gear shaped)
2. Scroll down the Settings menu, and click on Applications under the Phone section about two thirds down the page.
3. At the top of this new menu click on "Applications Manager".
4. In the top right corner of the Applications Manager menu click on "More"
5. Now a click on "Draw over Other Applications"
6. Scroll down this menu and find the offending application, in this example "Facebook"
7. Click on the button to the right of your offending application to deselect it.
8. Close out of the Settings menus.

NOTE: Alternately, deselect all the applications under step 8 except those you know pop up over other applications such as messaging, for example.

your device is going into a mode which allows you to flash a rom to the device....gets there by holding vol up and power button at the same time. from the device shutdown mode press vol down then power button....should take you to the correct screen with a list of options

It would be cheaper to buy a new tablet than to replace the cracked screen. The damage could be further than just the screen. This could make it not unlock.

Try the power button and volume button trick

Hold down the power button for 30 seconds and then turn it back on.

my htc windows mobile screen is blinking continuously around the screen edges only, so please give a solution for me

http://support.google.com/android/bin/answer.py?hl=en&answer=2425149

Visit the above link to how to change the lock screen options.

my samsung highlight will come on but it will go right back off again

Turned my g1 telephone off and went to put it on again the android loads then the screen goes blank.