3ds to mgba to 3ds

Started playing emerald on my 3ds dumped save with gm9 so I could play on mgba I can’t for the life of me get the save to inject back onto 3ds it keeps saying failed to inject I found another Reddit thread saying they fixed it by converting it from a gba 128kib + rtc file to gba 128 kib using mgba that didn’t work any ideas