Converting ROM to card2 will make it work.Will you make it run the later AP games?
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Failed to read the save.what happens though?
if you're able to reproduce the problem, can you test if converting to card2 bypasses the problem and lets it work correctly?
what about resetting the save data to factory default with save data filer or something?
It turns out that UP flash is the save itself, so card2 should not be affected.
I think the cause might be a poorly soldered UP flash.