So I'm new to this and have some troubles...
Well I recently bought an Iphone for my girlfriend and our anniversary. It was already jailbreaked and unlocked so it worked with any SIM. I advised her NOT to update through iTunes but she does.
So now I'm stuck with the 3.1 firmware, with a baseband of 5.11.07 -I believe- and a 06.02 bootloader.
I know I can't downgrade the bootloader so I can jailbreak and unlock, at least for now, but I'm curious to see if it is possible to build a custom ipsw with a lower firmware version with a any of the bootloader I see around -3.9 and 4.6 I think- so when installing it via iTunes and DFU mode it can change the bootloader.
I don't even now it what I'm asking is possible and if it is, if it will change the bootloader.
Any answer will be appreciated.