I have numerous 871 routers and have never seen this. I turn the router on and it goes into rommon mode which is expected but all of the LAN lights, the OK light, and the LNK light on the WAN is green but not a single cable except the power is plugged in. Is this normal when in rommon mode? I have tried to tftpdnld with the following settings and this is my output.
Do you wish to continue? y/n: [n]: y
*** line too large ***
ARP: address resolution for 10.0.1.154 timed out.
ARP failed with failure code 3. TFTP transfer aborted.
TFTP: Operation terminated prematurely.