Can mtd-write2 backup a CFE?

[rs232]

The title says it all.
I'm in the router (running fine) and would like to make a backup of the CFE.
Is there a way to achieve this with the mtd-write2 command (or alternative) without need to have access to the box physically?

Thanks!

 

[ColinTaylor]

Which router model?

 

[rs232]

Asus Rt-AC3200
I ended up running this:

dd if=/dev/mtd0 of=/tmp/cfe.bin

I guess that's correct?I now need to find a way to upload this on a bricked brother device via serial connectivity only :-/

 

[RMerlin]

The serial interface cannot be used to recover a corrupted CFE, only JTAG can.