In some cases, this error message is displayed while issuing the tftpdnld ROM monitor (ROMmon) mode command to copy an image to Flash.
To resolve this issue, perform these steps:
Issue the confreg 0x2102 command and reset. If the confreg 0x2102 command is not issued, the router boots to ROMmon mode after the reset, as shown in this command output example:
The router should now boot properly.
During software upgrade
Please reset before issuing this command