ehm, well i am an electronic engineer so actually i know very well what we are speaking about as i develop firmwares too.
the point is that BUffalo doesn't released any firmware for my router, and it is not possible to backup it using the router web interface.
even if i can try to open it and look for a ttl or jtag connector on the circuit board and try to backup the nand flash content, i don't want to open it, or at least not now.without documentation it may be unsafe to do this operation.
but i am more interested in speaking about another question related to this one.
suppose that we obtain from an unofficial flash dumb or from buffalo, the binary file of the original firmware. Are you sure that we will able to flash back it through the unofficial DDWRT firmare IF IT IS ENCRYPTED ?
if the original firmware is encrypted and the key is built in it, we will never be able to restore the official over an unofficial one. the only solution is to crack the key.... so ... withdraw