Acer Iconia Tab B1-A71 / B1-710

Step 1 : From the reset hole we can make reset without erasing data.

 

 

 

 Step 2

Power of the tablet. Push and hold Vol(+) and Power On keys together in the same time.

 

 

 

Step 3

Now you are in the Boot Mode menu. With Vol(+), (-) go to [SD Update Image Mode] and select it with Power On key.

 

  

Step 4

Now you are in Android System Recovery Menu. Choose "wipe data / factory reset", "Yes -- delete all user data". And finally "reboot system now"

Step 5

After restart you will have empty (free of data) device and access to it.