cisco 881 with flash error

[zhangvif]

Hello folks, I installed the Cisco Configuration Professional Express 3.5.3 into a cisco 881-k9 flash successfully, but after an updating the ios by using this new CCPE interface, the update page has turned to endlessly waiting, after 10-15min, I had to power off the unit to interrupt the operation, but since then the unit can't boot and it says can't boot from flash.

under the rommon mode, I tried to tftpdnld the ios, but no success, it fails after transferring the file to router saying can't access flash, but I can still dir flash:, but I can't dir bootflash:, so I presume after tftp ios to router it still needs to read or write from flash in order to execute the firmware, for this reason, I used tftpdnld -r, but same result, it fails every time finishing transfer the ios file to router.

my question is can we boot the unit with a usb key instead, then format flash afterward? or the unit is really bricked? the systems says "can't read flash fs", I guess it's the flash file is messed up. any suggestion? thank you!

[balaji.bandi]

if you have USB, copy the stable image to USB and try to boot let us know if that works ?

>boot usbflash0:stable-image.bin (replace stable-image.bin with your working IOS name).

if it boots success.

post below commands output :

show version

show boot

dir

[zhangvif]

H Balaji, I tried to format a 2G usb key since I don't have any smaller size, I used fdisk to resize it down to 256M and even 128M to let router recognize it, but failed again, the system always says can't load, I don't know what's the reason.

Also the strange thing is as I've mentioned in my 1st post, why tftpdnld -r fails? the ios was successfully transferred to router, but it fails right after than, so I guess it must needs a tmp folder to decompress the files and that default temp folder would be flash: then, I'm wondering if there is a way to set the default device from flash: to usbflash0: instead? Under the rommon mode, we don't have much option. 

I'm also thing of Jtag option, but I have limited info for that alternative, any other suggestion? Thank you!

[balaji.bandi]

format the USB with FAT 32 format.