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New Member



any body help me regarding fallowing issue

router 2821 can not boot properly

it is showing

Upgrade ROMMON initialized

device does not contain a valid FS

boot: cannot open "flash:"

boot: cannot determine first executable file name on device "flash:"

c2821 platform with 524288 Kbytes of main memory

Main memory is configured to 64 bit mode with ECC enabled

Cisco Employee

Re: srikanth


According to the output you have provided, the Compact Flash card in your router is either corrupt or has become unusable. These CF cards do this occassionally. Do you have a similar 2821 router? If yes then try using its CF card in your router to see if it boots up. Then try to format the original CF card using the command format flash: and if that works out, store the IOS image back on the card.

Best regards,


New Member

Re: srikanth

I have farmated the flash and load the ios image "c2800nm-adventerprisek9-mz.124-24.T2.bin" with another cisco 2821 router but still i facing  the same problem.

Cisco Employee

Re: srikanth


The issue seems to be a corrupted image or corrupted flash. If you have any other router that accepts the flash card and uses same type of file system (typically all ISRs use same file system), then you can put the flash card over there and format it. Then copy the image again to the flash (when you do it on non 2811 router, it might complain, ignore it). If you do not have another device, then you break into ROMMON and then use "tftpdnld -r" option to boot the router by loading the image in RAM.  Then you can use the same router to format the flash.

Here is a document on recovering the router using tftpdnld.

Hope this helps.



New Member

Re: srikanth

I have formated the flash and load the ios image (c2800nm-adventerprisek9-mz.124-24.T2.bin) with another cisco 2821 router still i am facing same problem