yeah go to this website and download the 3.1.2 2g firmware
iPod, iPhone and iPad Firmware Download
open itunes shift + restore, select the firmware you downloaded, restore
2.2.1 is obsolete, you better off with 3.1.2
jailbreak with redsnow 0.9.2 (custom firmware is way better than that open sourced blackrain bullshit)
get custom boot logos off of google images size should be 320 x 480 or it wont work with redsnow.
download redsnow here
Dev-Team Releases RedSnow 0.9.2 | AllTechRelated
go onto you tube and search
redsnow 0.9.2 with iotuch 2g
and you'll get a shit load of videos showing you how to do it.