Remove all battery and CMOS battery
Press F1 to enter settings: password 1234
Wait 20 seconds or more
Enter hardware ID.
Press double spacebar when prompted.
Turn off the computer.
And restore your original BIOS.
Enjoying.
If it's 2x5 beeps, it's normal.
I didn't checksum but it should be on anyway.
Wait at least 30 seconds before the screen logo light turns on. It should turn on/off by itself several times.