If you don't know the password, do not continue to enter the incorrect password. If you enter the password incorrectly three times in succession, the projector's operation is locked and you'll need to disconnect the power cord, then reconnect it to redisplay the password screen. If an incorrect password is entered 30 times in a row, the projector will be locked and you'll need to contact Epson.
If you enabled the password before you set one and you see the prompt to enter the password, enter the default password 0000 to proceed.
If you set a password and then enabled it, but have now forgotten it, you'll need to contact Epson.