You will need to flash an android "Update image" first, into EMMC, to go back to factory defaults. https://wiki.youyeetoo.com/en/YY3568/unpack     https://drive.google.com/drive/folders/11BrqafnkEyFaM-D0gaPFhrmnRM47JAEU     MaskRom mode upgrade firmware First of all, make sure that you have entered the MaskRom upgrade mode, and then perform the following firmware upgrade operations.     Upgrade firmware in loader mode Open the AndroidTool