Cisco 857: Bad block number

Unanswered Question
Jan 11th, 2008

My router was unable to boot normally and none of the LEDs were on after 15 seconds of booting it. So I connected to it using PuTTY and here is the output:

System Bootstrap, Version 12.3(8r)YI4, RELEASE SOFTWARE

Technical Support:

Copyright (c) 2006 by cisco Systems, Inc.

C850 series (Board ID: 2-149) platform with 65536 Kbytes of main memory

flashfs[0]: Checking block 62...bad block number (-1)

flashfs[0]: erasing block 62...

How long is this erasing supposed to take? The process seems frozen to me. Is there anything I can do at this stage? Configuring the router has been a nightmare from the start, I am way out of my league here so please help.

I have this problem too.
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jsivulka Thu, 01/17/2008 - 07:28

This is because your old flash had an IOS image in it, and your new flash didn't have an image? It might be happened due to the Ethernet 10BASE-T cable is unplugged.

hemuli666 Fri, 01/18/2008 - 07:31

This information doesn't really help me solve the problem of getting the device back online.

plumbis000 Fri, 01/18/2008 - 08:42

I don't remember if the 851 has an external flash disk, if it does not you will need to either TFTP_DNLD (if supported) or X-Modem to get a working image on the device and bring it back online.


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