When I put my pokemon pearl rom back into my laptop and then back into my R4iTT, my save file was deleted, also, when I try to load pokemon platinum it says "error -82, please reset system"
Try backing up everything important such as the ROMs and saves and then google the kernel file and after that format you microSD card with SDFormatter and place the kernel, games and save file. If you can't find the kernel for your cart just leave a response and I'll check my datavase if I saved any kernel files for the said cart.