Yea you guys saying Filezilla doesn't work are wrong it works fine. You don't have it setup properly. We wouldn't be transferring games back and fourth either if it wasn't copying files correctly. It HAS to be set to active and 1 connection at a time.
for me the same problem. black screen! I have psgroove 1.1 with peek & poke lv1 calls added (tested, memory dumper works fine!). I copied dev_flash 4 times with two different FTP programs (Filezilla and WinSCP), each time was the same size. I have a PS3 60GB PAL, European version.