With edizon.se, because checkpoint isn't working on me , select edizon.se without any game selected and back up the game you want, make a zip on the computer and send it here. If you are confused there's so some tutorials on YouTube.
Can't find any threads about this particular issue on GBAtemp or the wider intarwebz. Saw one video on YouTube that seemed relevant, but it was some dude with the same issue, no solutions offered in the comments. :/