I've got an 837 SOHO router with some old config. Once the image is decompressed console output ceases. I thought it was just a baud rate change in the config and so I initially just poked through the different standard baud rates with no luck. Then I tried the old confreg 0x2142 NVRAM bypass; Same problem. After a bit of Googling I thought that maybe my cookie was bad, it wasn't. At this point, I'm out of ideas. Here's the output.
1. initial issue
System Bootstrap, Version 12.2(8r)YN, RELEASE SOFTWARE (fc1)
TAC Support: http://www.cisco.com/tac
Copyright (c) 2002 by cisco Systems, Inc.
C800/SOHO series (Board ID: 23-127) platform with 32768 Kbytes of main memory
program load complete, entry point: 0x80013000, size: 0x886ed4
Self decompressing the image : ##################################################################################################################################################################### [OK]
2. boot to rommon, change confreg, reset. Problem persists
System Bootstrap, Version 12.2(8r)YN, RELEASE SOFTWARE (fc1)
TAC Support: http://www.cisco.com/tac
Copyright (c) 2002 by cisco Systems, Inc.
C800/SOHO series (Board ID: 23-127) platform with 32768 Kbytes of main memory
monitor: command "boot" aborted due to user interrupt
rommon 1 > confreg 0x2142
You must reset or power cycle for new config to take effect
rommon 2 > reset▒
System Bootstrap, Version 12.2(8r)YN, RELEASE SOFTWARE (fc1)
TAC Support: http://www.cisco.com/tac
Copyright (c) 2002 by cisco Systems, Inc.
C800/SOHO series (Board ID: 23-127) platform with 32768 Kbytes of main memory
program load complete, entry point: 0x80013000, size: 0x886ed4
Self decompressing the image : ##################################################################################################################################################################### [OK]
3. verify cookie
System Bootstrap, Version 12.2(8r)YN, RELEASE SOFTWARE (fc1)
TAC Support: http://www.cisco.com/tac
Copyright (c) 2002 by cisco Systems, Inc.
C800/SOHO series (Board ID: 23-127) platform with 32768 Kbytes of main memory
rommon 1 > cookie
cookie:
01 01 00 0f 8f e7 dc 85 7f 00 01 ff 00 00 00 00
00 00 00 00 00 00 00 00 41 4d 42 08 15 31 4d 44
32 05 00 00 00 00 00 00 00 ff ff ff 50 04 4a 0b
ab 05 ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
rommon 2 >
