cisco 3945 router space issue on the device, how to perform upgrade IOS image

[sankardevarajan1986]

space issue on the device how to perform the IOS image upgrade?

due to space issue if we remove old one & reload the device with new IOS and if its not work?

what are the steps need to perform restore old image?

[chrihussey]

Hello,

If the router doesn't boot up with the new image it should come up in rommon mode. You can then use the "TFTPDNLD" utility to restore the old image. See the attached link below:

https://www.cisco.com/c/en/us/td/docs/routers/access/1900/software/configuration/guide/Software_Configuration/appendixCrommon.html

Hope this helps

[Leo Laohoo]

Post the complete output to the command "dir".

[sankardevarajan1986]

Directory of flash0:/

2 -rw- 3064 Mar 27 2014 11:35:50 +05:30 cpconfig-39xx.cfg

3 -rw- 33802 Jun 18 2015 13:10:44 +05:30 high_cpu.txt

4 drw- 0 Mar 27 2014 11:36:08 +05:30 ccpexp

245 -rw- 2464 Mar 27 2014 11:37:52 +05:30 home.shtml

249 -rw- 375638 Mar 30 2017 16:33:16 +05:30 crashinfo_20170330-163316-IST

250 -rw- 347597 Apr 18 2017 17:05:30 +05:30 crashinfo_20170418-170531- IST

252 -rw- 315937 May 24 2017 14:16:40 +05:30 crashinfo_20170524-141640-IST

253 -rw- 376802 May 24 2017 15:47:22 +05:30 crashinfo_20170524-154723-IST

254 -rw- 330762 Jan 15 2018 13:16:10 +05:30 crashinfo_20180115-131611- IST

255 -rw- 600 Feb 2 2018 16:24:14 +05:30 vlan.dat

256507904 bytes total (51994624 bytes free)

[Philip D'Ath]

You should delete all the crashinfo*.* files for a start to recover some space.

[Leo Laohoo]

Ok, so someone has deleted the IOS file. 

Look at the back of the router (image below). 

Pay close attention to point 11.  Remove the lid to CF0 and there should be a CF inside.  Eject that and use a multi-card reader to copy a VALID IOS into the CF.  Put it back into the router and reboot the router.

[Joseph W. Doherty]

Does a 3945 have a CF or USB port? If so, you can store the original flash on that.

[Georg Pauwen]

Hello,

on a side note, the 3945 runs the Universal image, all of those require 1024/256 DRAM/Flash, which is equal to the amount of DRAM and Flash your router comes with. If you download a valid image, there is no real reason why it shouldn't work...