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New Member

2841 router Flash is not detected

Please help .

I have 2841 router but unfortunately when turn on router ,prompt goes to romon mode.After changing confreg 0x2102 & rebooting the router ,router does not come to normal.Show flash' does not contain any output on the flash.Please help me by a document.

Thanks in advance


Re: 2841 router Flash is not detected

Instead of using "sh flash" you should use "dir" in rommon. That should display the contents of your flash.

Please see the following link to help you in rommon:



New Member

Re: 2841 router Flash is not detected

Thanks you very much.

Let me try

Cisco Employee

Re: 2841 router Flash is not detected


According to the output you have posted here, the router does not even recognize the Compact Flash (CF) card.

Have you already tried to remove and reinsert the CF card? Sometimes they get loose and just a couple of disconnected pins can cause this problem.

If this does not help, do you have any other 2841 router with a similar CF card? If yes, try swapping the CF cards to see if the other card works in your router.

It can also be that your CF card is faulty. It has happened to me before and in fact there was a series of faulty CF cards that required replacement. It was documented in Cisco Field Notice document here:

While I doubt that you have one of those CF cards, it might be that it simply passed away. If that is the case, you can also replace it by a normal stock CF card (if possible not larger than 1GB).

Best regards,


Hall of Fame Super Gold

Re: 2841 router Flash is not detected

Do you have any other 2821 or 2841 router available? If so, you can use that unit's flash and boot this unit that's having a problem.

Is this CF came with the router?

What is the size of this CF?

How to Download a Software Image to a Cisco 2600 via TFTP Using the tftpdnld ROMMON Command

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