Ok, after searching on multiple forums, including NASIOC, I can't seem to find much information about the error I'm getting.
So, I've renamed my ROM as A4SGC00C.hex and converted it 192kb, but when I try to apply the patch, it gives me the error:
ERROR: Source file is corrupt at byte 0x1fef0 (0xff expected, 0x3b found)!!
I've checked the ROM ID in ECUFlash and it matches (A4SGC001), the rom had previously been tuned by Vishnu, but it does not seem to be locked because I can still edit values.
The file can be opened in ECUFlash without a problem, but when I try to open it in RomRaider, I get the error: "Error - Data Mismatch Table: Catalyst Readiness Threshold Fix B Table editing has been disabled".
I suspect this may be the cause of the error, in which case does anyone know a way around it? Would it be ok to flash a stock rom and simply change all of the values over? Thanks.