
Hi
I don't think you can recover previous files. You have to format it (fat32, 32kb cluster) and re-install the cfw.
You simply need to copy Memory Pit and TwilightMenu++ to the SD card; you can also install Unlaunch but it is not essential:


Unlaunch, depends on your purposesThanks, so Unlaunch / HiwaCFW is not necessary ?
I only have Memory Pit and TwilightMenu++ and play NDS, NES, GB, SMS roms and Quake/Doom ports etc with ease. The others softwares allow you to have more functions available (eg unlocking old flashcarts) but their installation has a certain bricking risk.
Unlaunch, depends on your purposes
hiyaCFW, serves no functional purpose