I have a 4DPS with a non-functional PS2 port on 1.71. I'm wanting to try a few BIOS updates to see if I can fix it. Had a go at flashing with AMIFLASH but it cannot erase the chip. Peeled off the sticker and it's a 27C010A-12, a UV erasable EPROM... Hoping to not spend silly money to get a decent …