Don't know if I did some thing stupid or if this is a well known thing, but I just had some trouble manually installing Rockbox using Izarc. When I extracted the zip to the player, it removed the period from the beginning of the folder name so from .rockbox to rockbox. Then of course the bootloader couldn't start and it took a little while to figure out why. Then when I extracted .rockbox with the inbuilt windows zip utility and copied that onto my ipod, windows couldn't distinguish between the two folders, the .rockbox and the rockbox... very strange. I tried to delete everything and start again and now rockbox seems to be working fine but I hope I haven't got some orphaned undeleteable folders lurking about. Anyway just a heads up if this isn't that common and someone else gets the same problem.