Cisco 2811 IOS Installation Problems

[TautvydasVaiciulis]

Hello. I am trying to install IOS to Cisco 2811 router and I get this message (below). I can't figure out what I need to do to properly install the IOS. Can anyone advice me ? Thank you.

Upgrade ROMMON initialized
program load complete, entry point: 0x8000f000, size: 0xcb80
open(): Open Error = -66
boot: cannot open "flash:"
boot: cannot determine first executable file name on device "flash:"
c2811 platform with 262144 Kbytes of main memory
Main memory is configured to 64 bit mode with ECC enabled

Upgrade ROMMON initialized
Entering rommon> prompt after several failed attempts to boot an IOS image.
Please check your internal/external flash drives for the correct IOS image
and issue 'reset' at the rommon> prompt to re-try the boot process.

[Leo Laohoo]

Post the complete output to the command "dir flash:".

[TautvydasVaiciulis]

rommon 6 > dir flash:
program load complete, entry point: 0x8000f000, size: 0xcb80
open(): Open Error = -66
dir: cannot open device "flash:"

rommon 7 > dev
Devices in device table:
id name
flash: compact flash
bootflash: boot flash
usbflash0: usbflash0
usbflash1: usbflash1
eprom: eprom

[Leo Laohoo]

Is there a compact flash in the router?

[TautvydasVaiciulis]

Yes.

[Leo Laohoo]

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@TautvydasVaiciulis wrote:
dir: cannot open device "flash:"

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Either the CF is faulty or the CF slot is faulty.

[TautvydasVaiciulis · Accepted solution]

Well.., after a lot of research and experiment I deduced the problem to formatting, even though the Windows, Linux recognized the CF and let it reformat it FAT, FAT16 etc., it didn't worked. So far I think the CF is good, it just needs to be reformated inside IoS and then the problem should disappear. Definitely would like to know how formatting inside IoS is different then Windows. Anyway, thank you for your help !