"sfix.sfx" is a file in the bios. google the bios until you find one that works. If you are 100% shure you have the correct bios then re-naming the files might work(open zip file).
NG-LO.ROM should be named 000-LO.LO
NG-SFIX.ROM should be named SFIX.SFX
NEO-GEO.ROM should be named SP-S2.SP1
hope this helps.
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