If your projector is stuck on the boot screen or the OTA update fails, you must flash the firmware manually using a USB flash drive. Requirements: A USB flash drive (FAT32 format, preferably 8GB or 16GB).
Keep holding the button until you see a progress bar or an Android upgrading logo on the screen. Release the button. wanbo t2 max firmware
Example B — Rollback after bad update (requires vendor/serial access) If your projector is stuck on the boot