How to Root ACER ICONIA ONE 10 (B3-A20)
HOW TO ROOT ACER ICONIA ONE 10 (B3-A20)
1. Enable USB Debugging
Settings > About Phone > Build number > Tap it 7 times to become developer;
Settings > Developer Options > USB Debugging.
2. Enable installation from unknown sources
Settings -> Security -> Unknown Sources
3. Download KingoRoot and install it
Go for this page and download it on your tablet.
From the Downloads folder, identify the kingoroot apk and install it.
4. Root the device.
The process should be straightforward, for me it worked as a charm from the first time.
After this step you should have a rooted tablet.