Reinstalling Firmware

[GeekAtBirth]

If a Jailbreak goes wrong and I have to restore to a firmware, how do I do this?
I am on 3.1.2.
How do I save a firmware?

 

[Night Spring]

If a Jailbreak goes wrong and I have to restore to a firmware, how do I do this?
I am on 3.1.2.
How do I save a firmware?

It's saved somewhere on your computer when you update/restore through iTunes, but I find it easier to just download it from here and save it somewhere I'll remember.
http://www.felixbruns.de/iPod/firmware/