Pokemon Platinum Save Issue

Hello! Nice to meet you all. I searched for other topics in relation to this- here and on other places- but have yet to find a solution to my problem.I have Pokemon Platinum [USA] on my M3 DS Simply. Originally I had firmware from...aeons ago, I think, and it played the game just fine. However, I got Pokemon White yesterday [from here, in fact] and so installed R4 Wood.My problem is...when I load up Platinum (primarily to trade my pokemon off to a friend, to get them onto White), it starts up a new game every time. I have checked the files several times. They have the same names- there is also a *.nds.sav and a *.sav file. So the files are there! But the game just refuses to boot it up.I have read other places...something about the file size corrupting it. I don't know. I don't really understand it? The save files are 512KB. If it is a size error that is corrupting it, is there a way to fix it without losing my data? I have several important pokemon that are rarer [and achieved without AR or anything], so I would like to do my best to keep them?Thank you very much in advance.

512KB is not corrupted by size hm.... interesting

no, are you trying to save stuff from an AR device for the DS, if you then i might have a solution for you

I couldn't say for sure? I'm new to this.Originally I played Pokemon Platinum on my M3 DS Simply, with it's original firmware from like..2008 or something, I think. But I upgraded to the R4 Wood firmware just a couple of days ago. Still an M3 DS Simply card, though.

ok >__>sorry, sounded like you might have been using an AR device to backup a save from a retail cart to use, sorry about the mix-up there