: fastboot erase userdata then fastboot reboot .

Good news: The bootloader on the iPlay 20 is unlockable. You enable OEM unlocking in Developer Options, then use fastboot oem unlock (or fastboot flashing unlock depending on the firmware version). No weird codes or paid tools required. So far, so good.

The Alldocube iPlay 20 is a diamond in the rough for tinkerers. While it doesn't have the massive development community of a Samsung or Google device, the ability to run a transforms it from a budget media slates into a modern, fluid Android tablet.