Chew,
Link to upgrade the firmware: http://www.cisco.com/en/US/docs/routers/access/1900/software/configuration/guide/upgrade.html
1- when upgrading the IOS, the configuration is preserved. You do not need to take any specific precautions - you simply store the new IOS file into the FLASH and configure your router to load it (using the boot system global configuration command). Optionally, you just erase the old IOS image and let the router boot the only IOS image it finds in the FLASH, in this case, the new one. Of course, making a backup of your running-config to a network server would be a wise precaution but once again, upgrading the IOS on Cisco devices does not affect the stored configuration.
2- I suppose you have the new IOS image available already. The 1921 router has an USB socket - one of the easiest ways to transfer the IOS into the FLASH memory of your router is to copy it to an USB key on your PC and then copy it from USB to FLASH on your router. The USB key would need to be formatted using either FAT16 or FAT32. Specifically, the router will not be able to read NTFS filesystem.
Another option would be to copy it via network using HTTP, SFTP or FTP you have such servers available and the router is capable of communicating with these servers over network. In both cases, the copy command is:
copy source destination
so in your case, either
copy usb:c1921-whatever.bin flash:
or
copy http://1.2.3.4/c1921-whatever.bin flash:
assuming the IOS is available via HTTP on the server 1.2.3.4. Please make sure beforehand using dir flash: that your FLASH has enough free space to hold both IOSes.
Ref:https://supportforums.cisco.com/thread/2188791
HTH
Regards
Inayath
*Plz rate if this info is helpfull and mark the thread as answered if this solved your query.
