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New Member

Device not programmable


I have a 2511 Cisco router which I should downgrade it's IOS version to support IS-IS from c2500-is-l.123-26.bin to version c2500-js-l.122-24a.bin

when I used copy tftp flash command the router successfully reload and try to start the copy process, this copy process always failed.

I set the register value to 0x2101 to start in romom


I issued enable command


from this prompt no erase command is look like available


clear Reinitialization functions, type "clear ?" for list

configure Configure from terminal or over network

connect <host> Connect to host - same as typing just a host name

copy copy flash tftp or tftp flash

debug Enable debugging functions, type "debug ?" for list

disable Turn off privileged commands

disconnect <cn> Break the connection specified by name or number

enable Turn on privileged commands

exit, quit, logout Exit from the EXEC

name-connection Give a connection a logical name

ping Send echo messages

reload Halt and reload system

resume Make the named connection be current

setup Initialize system configuration

show <cmd> Information commands, type "show ?" for list

systat Show terminal lines and users

telnet <host> Connect to host using telnet protocol

terminal Change terminal's parameters, type "terminal ?"

test Run hardware tests, type "test ?"

trace <address> Trace route to <address>

undebug Disable debugging functions, type "undebug ?" for list

where Show open connections


which-route Display CLNS route table lookup

write Write configuration memory, type "write ?" for list

<cr> To resume connection

when I issued sh version command

Router(boot)#sh vers

3000 Bootstrap Software (IGS-RXBOOT), Version 9.14(9.b), MAINTENANCE INTERIM SOF


Patchlevel = 9.1(12.6)

Copyright (c) 1986-1995 by cisco Systems, Inc.

Compiled Fri 03-Feb-95 07:11 by chansen

System Bootstrap, Version 4.14(9.1), SOFTWARE

Router uptime is 42 minutes

System restarted by power-on

Running default software

cisco 2500 (68030) processor (revision C) with 16380K/2048K bytes of memory.

Processor board serial number 01760615

DDN X.25 software, Version 2.0, NET2 and BFE compliant.

1 Ethernet/IEEE 802.3 interface.

2 Serial network interfaces.

32K bytes of non-volatile configuration memory.

16384K bytes of processor board System flash (Device not programmable)

Configuration register is 0x2101

I see device not programmable

if I tried copy tftp flash command I received : ERR: Device in READ-ONLY state

I was upgrade it's flash memory in the pass to a newer IOS software, now I need an older one version someone could help me ??

Hall of Fame Super Silver

Re: Device not programmable

hello Christien,

try to see if you can boot from tftp and try to load the image for isis.

I don't understand this part at the beginning of your post:

>> when I used copy tftp flash command the router successfully reload and try to start the copy process, this copy process always failed.

a copy tftp flash shouldn't cause a reload.

Have you been able to write the new IOS image in flash and the the router fails to boot with the isis image, or really it rebooted during file copy?

refer to following doc for recovery from rommon

I hope you have saved a copy of old image.

Have you also checked the RAM needs of isis image?

Hope to help


New Member

Re: Device not programmable

Hi Giuseppe,

I have 2 2500 routeurs configure with same flash and memory quantity. The router with which I have problem have an older version of bootstrap than the other.... Tu upgrade the bootstrap what I read we need to change one chip on the board and this router serie is End of life End of support on Cisco.... may be I can finnd newer chip on E-bay, but I was able to upgrade this router to the current IOS with same flash chip...

on both router when we using copy tftp flash command we received a prompt message advertiszed the router will reload (when the router as start normally the flash memory is in read only mode) during the reload the file transfers should work at this time (what I had with the working one) but on which I have problem I received error message copy flash failed....

My router have maximum memory RAM and flash possible 16Mb of flash and 16 Mb of RAM.

I have to downgrade the IOS but in 12.3 IS-IS is not in the image for this serie of router and it is in the 12.2 version series....

Hall of Fame Super Silver

Re: Device not programmable

Hello Christian,

I'm realizing that I've probably never upgraded a C2500 otherwise I would remember this different behaviour of reloading after giving copy tftp flash...

or I'm simply becoming too old to remember?

Best Regards