Dell 5310n printer gives error message 900.05 and needs help

When I switch on the printer, following error is displayed:

"900.05 Service - RIP Software"

I suspect it's firmware is broken

Question: can this be repaired? Already tried ftp connection to the printer but its refused (probably because of broken firmware?), is there another way to reset/upgrade/re-install firmware of it?

Or should I just forget it and dump it into the trash?