NONNNOOOOOO dont do what he said^^^^^^^^^^ IF FIXED IT!!
1. right, take ur JB device and all usbs out and delete the FTP on ur console.
2. Now turn off from the back and turn back on.
3. Plug in ur JB device and turn ps3 on and press eject... should go red.
4. plug in ur usb with the FTP on it.
5. go and install the package, then start FTP.
6. It should now work, take ur usb out and always have ur JB plugged in.
7. remember to press on and eject evrytime you turn on! then it should work!!
HOPE I HELPED!! worked for me!!

---------- Post added at 04:50 PM ---------- Previous post was at 04:42 PM ----------
NONNNOOOOOO dont do what he said^^^^^^^^^^ IF FIXED IT!!
1. right, take ur JB device and all usbs out and delete the FTP on ur console.
2. Now turn off from the back and turn back on.
3. Plug in ur JB device and turn ps3 on and press eject... should go red.
4. plug in ur usb with the FTP on it.
5. go and install the package, then start FTP.
6. It should now work, take ur usb out and always have ur JB plugged in.
7. remember to press on and eject evrytime you turn on! then it should work!!
HOPE I HELPED!! worked for me!!