Hi @Kuronami:
I have imported a lot of fake ipod nano MP4 players and had to format a lot of them because the buyers where not reading the manual. They just disconnect their player without closing the USB port first. Resulting in corrupted files.
Till now I formatted all the players without any difficulty so far, I did it through Windows XP. The clue is to format it in FAT format (not FAT32). After the format keep the payer connected with your computer and upload the firmware (use MP3 Player Utilities version 3.68, it’s the most stable version).
I have uploaded a slightly modified v3.5.37 firmware version in de upload section but it is still not visible there!?!
Therefore try this link
www.sundust.eu/TR_v3.5.37_080606.bin to download the file from my own server. I managed to recover three MP4 players with this bin file, they all had a black screen after a unsuccessful firmware down/up grade! I hope it will work for you as well.
I have a couple more firmware’s for you to try if this one fails, I will upload them tomorrow.