My router has been working very well in production for over a year and following a power cut the boot port is dead and the router displays this message:

loading kernel... OK
setting up elf image... not an elf header
kernel loading failed
Please, check ethernet cable...

I know how to fix it with netinstall but the boot port does not respond. How can I change the ethernet port to boot on another one or give me an idea please.
My router is a ccr-1009-7g-1c-1s +,
thank you in advance