09-28-2006 09:48 AM - edited 03-03-2019 02:09 PM
Hi dear Cisco fellows,
I have a 837 cisco router with an empty flash. I am trying to download from tftpserver an IOS image but i always got a Bad Checksum error:
rommon 24 > dir flash:
File size Checksum File name
9819796 bytes (0x95d694) 0x8bb2 c837-k9o3sy6-mz.124-8a.bin (bad checksum
: 0x9ba4)
rommon 25 > boot flash:c837-k9o3sy6-mz.124-8a.bin
Checksum failed on c837-k9o3sy6-mz.124-8a.bin
Expected checksum: 8bb2, calculated checksum: 9ba4
open: file "c837-k9o3sy6-mz.124-8a.bin" not found
open(): Open Error = -1
loadprog: error - on file open
boot: cannot load "flash:c837-k9o3sy6-mz.124-8a.bin"
What can i check?
09-28-2006 09:59 AM
Download a fresh copy from CCO and try the new image.
HTH
09-28-2006 10:02 AM
I agree that trying a new image is a good idea. And depending on what you are using to transfer the image make sure that it is done as a binary transfer rather than as an integer transfer.
HTH
Rick
09-28-2006 11:14 AM
I have downloaded the latest IOS available and i get a bad checksum, i have tried other releases and it is the same.
I am using tftp server from solarwinds and i launch tftpdnld from Hyperterminal.
File reception completed.
Copying file c837-k9o3sy6-mz.124-7c.bin to flash.
Erasing flash
Programming flash .Programming flash .Programming flash ........................
................................
rommon 28 > dir flash:
File size Checksum File name
9988944 bytes (0x986b50) 0x485e c837-k9o3sy6-mz.124-7c.bin (bad checksum
: 0x358e)
09-29-2006 02:38 AM
The badchecksum is for the router checksum. What does that mean?
09-29-2006 07:27 PM
Have you tried to delete the partition on the flash device, erase the filesystem and recreate it? I was thinking there might be something fouled on the flash device that is causing the checksum to fail.
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