Flash erase error in ROMMON

[supportgtb]

Dear Team,

We are unable to upload IOS into 3660 Router.

When we boot the router, the following error is displayed and router is going to rommon mode.

device does not contain a valid magic number

boot: cannot open "flash:"

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

We used xmodem to upload IOS in it, it uploads the IOS and gives the following error

rommon 1 > xmodem -c c3660-is-mz.120-7.XK1

Do not start the sending program yet...

device does not contain a valid magic number

dir: cannot open device "flash:"

WARNING: All existing data in flash will be lost!

Invoke this application only for disaster recovery.

Do you wish to continue? y/n [n]: y

Ready to receive file c3660-is-mz.120-7.XK1 ...

Erasing flash at 0x30000000 sector erase failed at location 0x30000000,

status 0x20202020 flash sector will NOT erase...aborting

rommon 2 >

[Kevin Dorrell]

It looks like the flash memory itself is the problem. The possibilities I can think of are:

1. The flash memory is broken and needs to be replaced.

2. The flash memory is write protected (Switch tab on PCMCIA module).

The flash on this model can be a flash SIMM module and/or PCMCIA. It supports 8 - 64 MB SIMM, and 2 - 40 MB PCMCIA.

There is some stuff about how to replace the flash in http://www.cisco.com/univercd/cc/td/doc/product/access/acs_mod/cis3600/hw_inst/hw_notes/3636mem.htm#wp72194

There is some stuff about how PCMCIA flash is handled in http://www.cisco.com/univercd/cc/td/doc/product/access/acs_mod/cis3600/hw_inst/hw_notes/pcmcia.htm.

Try a dev command in rommon to see if the flash is listed normally there.

You could also try booting from a TFTP server from rommon, and then show flash from IOS to see its status.

Kevin Dorrell

Luxembourg

[s-cortes]

You can try xmodem -r.This would lunch the IOS using the DRAM.Then you can start troubleshooting flash after it completely bootup.Dont reboot the router or you will back at rommon because IOS is temporarily stored in DRAM.