Greetings! I have recently acquired a Mitsubishi Model MP3220 / MP386-25 and I cannot setup the BIOS unfortunately. After replacing the dead CMOS battery, I attempted to use the Phoenix BIOS setup utility, GSetup, and Landmark Setup, and none of them work, only leaving me with a "CMOS Checksum error, press F1" message . I'm assuming this is "one of those machines" that requires a special util/setup diskette, but I don't have it. 🫤 The post screen says "Phoenix 80286/80386 rom bios plus version 3.10".
Any help would be greatly appreciated.

Thanks!