going from 4.1 06.15.00 to 4.2.1 06.15.00
okay so i downloaded an app on my iPhone and to be able to use it the way i need to, i have to have 4.2 or later. i already have my iPhone 3gs jailbroken/unlocked on 4.1 with baseband 06.15.00. i have tried endless searches to try to see how to do this, but nothing is coming up since a lot of the procedures to do the 4.1 unlock have 4.2.1 tags. i have tried creating custom firmware bundle with pwnage tool 4.2, but i am not being given an option to install the iPad baseband. i have tried a few different versions of pwnage tool with the same result. i do have iPad firmware 3.2.2 downloaded.
i jail broke it myself, but it's been a while ago so i can't remember what process i used. it seems like i remember using sn0wbreeze, but i am not sure.