Boot into recovery (Power + Vol Up), perform a factory reset, then wipe cache.
To flash this device, you will need the following tools, often included in the firmware zip package: acer one 8 flash file
Warning: Avoid using "Format All + Download" unless the device is completely dead, as this can erase your IMEI/Serial Number. 4. Connect and Flash Click the button (green arrow) in the tool. Power off your Acer One 8 completely. Boot into recovery (Power + Vol Up), perform
Click the green button at the top of SP Flash Tool. The tool will enter a standby state. Turn off your Acer One 8 tablet completely. perform a factory reset