lost ether1 only serial possible upgrade ROS

I have lost ether1 on a RB2011 and the os on NAND is lost with an update.

is there any way to install ROS via serial ? ( or usb maybe ? )

i know the firmware can with a xxx.fwf file.

maybe there is special file somewhere for this purpose which i can upload via xmodem ?

As far as I know, the answer is “no”.