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corrupt router flash

Posted on 2006-04-05
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Last Modified: 2013-11-29
Hi colleagues,
i have a cisco 1720 router that i needed to upgrade the IOS. I went through the normal process of deleting the existing ram and uploading the new image. when i rebooted the router, i had this error :

loadprog: error - trouble reading file magic number
boot: cannot load "flash:"
 
when i do dir flash, i geth the information bellow.
rommon 5 > dir flash:
         File size           Checksum   File name
         0 bytes (0x0)        0xffff    c1700-sv8y-mz.122-15.ZL1.bin

can anybody help me out this is extremely urgurnt.
thanks
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Question by:thaclone
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Expert Comment

by:mattacuk
ID: 16384197
I am  no expert on  upgradeing the IOS but it may be  possibe you have  the configuration register set wrong. It should be set to 2102 to boot from flash. In any case here is a guide to upgradeing your IOS;

http://www.cisco.com/en/US/products/hw/routers/ps380/products_tech_note09186a0080094b23.shtml
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by:calvinetter
ID: 16386761
Notice the "File size" column shows 0 bytes, so somehow your IOS image didn't get copied to flash correctly or at all.  Connect via the console, power-cycle the router, interrupt the boot process (usually CTL-Break will work if using Hyperterminal), try copying via TFTP & say yes when it asks to erase flash.

cheers
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by:thaclone
ID: 16390084
thanks colleagues,
realised later that the flash size was only 8MB and the ios image was 13MB. so that was how come i was able to load to nvram but not into flash. i did an upgrade of my flash and  bingo its working.
thaclone
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