Optoma EP735 Service Manual page 106

5. After the following screen and message of "Download progress for file Flasher.HEX"
appear, press and hold on the power button until the 4th step of Gui.hex progress.
6. EP735 is under upgrading Firmware as follows.
EzPro735
EzPr735
S
M
ERVICE ANUAL
9 - 5