Unlocking a device you do not own is illegal. These methods are intended for users who have forgotten their own credentials after a hard reset .
The Ultimate Guide: Acer Iconia One 10 (B3-A40) FRP Bypass – 3 Working Methods acer iconia one 10 b3-a40 frp bypass
The search results were a jungle of conflicting advice. Some suggested the “Emergency Call” trick, but Android 6.0 (Marshmallow) on the B3-A40 had patched that hole long ago. Others mentioned using a USB OTG cable and a mouse. A few dark corners of forums whispered about custom SP Flash Tool ROMs—dangerous territory for a $5 tablet. Unlocking a device you do not own is illegal
Perform a "Factory Data Reset" from within the Settings menu, which may permanently clear the lock. Some suggested the “Emergency Call” trick, but Android 6
If the manual method fails, you can use a specialized tool on a computer. Tools Needed : Mediatek FRP Bypass Tool and Universal MTK Drivers. Install the drivers and restart your PC. Mediatek Universal Tools software and select Power off your Acer tablet completely. Volume buttons and connect the tablet to your PC via USB.