This was not a good idea... I tried this, and I did make a backup before I FTP'd the files over, which went just fine by the way... The only problem I have now, is that the STB don't boot. It comes to the "marbles", and that's it... It doesn't even read the USB-stick with the backup on, so by now I have no Vu+ to play with.
Any help/good advice what to do next? I can get to it by FTP, it seems, but that's more or less it.
Phuh... After x attempts, I finally managed to get it to read the USB, so now I'm back to basic. Should've read the whole thread before I tried this. (pooface's post)