Hi guys, i am trying to revert my cfe to the original version but i am always getting permission denied.

root@unknown:~# mtd  unlock  cfe                               
Unlocking cfe ...
Could not open mtd device: cfe


root@unknown:~# mtd  write -f cfe.bin cfe
Could not open mtd device: cfe
Can't open device for writing!


but i know it is there smile

ny ideas ?