Cisco update IOS from USB

Update your Cisco rom to the latest version. Howto update rom

In this post I have used the Cisco 1841 router.
Cisco 1841 IOS images can be downloaded here. Be sure the size of de flash and
the amount of DRAM is equal to the Cisco Router.

1. Insert the USB drive (FAT Formatted) into your computer and copy the image from your computer to the root of the USB drive.

2. Insert the USB drive into the Cisco device.

3. Connect to the device from a terminal and go into the user privileged mode.
4. Make a backup of your old IOS image.

5. Replace the old IOS image with the New IOS image.

6. Type “yes” when asked if you want to overwrite the current IOS.  Else delete the old IOS image with the delete commando.

7. Type “reload” to switch from the old IOS to the new one.

In some cases it’s better to change the bootvar (show bootvar)
#1 Go into the configure mode.
#2 no boot system
#3 boot system flash::c1841-advipservicesk9-mz.151-4.M6.bin

Comments: 2

  1. Mr Cisco November 11, 2014 at 13:14 Reply

    Don’t forget to change the boot variable!

    • p.vanos November 11, 2014 at 14:11 Reply

      I will updated the post sir.

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