Here the steps I got from the support:
How to do a Recovery Factory Reset
Warning: all your apps and settings will be erased. However, any software updates and preloaded apps will stay.
- Power off the projector
- Insert a pin or SIM eject tool in the Reset hole (see picture below), till you feel the reset button press.
- Keep it pressed and press-and-hold the power button to start the projector in Recovery mode.
- Once it starts in recovery mode, use the remote control to select “Wipe data/factory reset ” option.
- After the reset is completed, reboot the projector.
