Yep, I often swap BIOS chips from broken PAL units into working NTSC-J ones. So far every swap worked. I try to use donors that are at least close to the target hardware. A 5500 unit will get a 5xxx chip, a 7000 will work with a 9002 chip but it'd be better to find a 7502 or 7002 chip. Okay so theo...

I did the BIOS ROM swap mainly to eliminate the license data check which the Japanese BIOSes in earlier models have for some reason. Yeah exactly, circumventing that second region lock. But it is cool to know that slightly newer BIOSes are compatible with slightly older hardware. Means that there w...

I did a BIOS swap of an SCPH-7000 with an SCPH-7501's BIOS and it worked. It does eliminate the license data check but the PlayStation screen will still say SCEI as that string is stored inside the HC05. Okay this is interesting. I am going to be doing this pretty soon too but I am still waiting on...