iphone 3gs upgrade already jb & unlocked

[belegozi]

hey guys just want to know if i use unactivated ipsw on 3gs 3.1.1 unlocked 5.12.01 bb simplemobile to 4.2.1 and will it erase any pics?.....thanx, bel

[multipazz]

if you restore your device everything will go !!!

make sure you have backup of everything before you start

if you need to preserve your baseband for unlock..
make sure you use a custom firmware !!!

do you have SHSH blobs for 4.2.1 ?

if not then use a custom 4.1 firmware

make sure it is custom not original as 4.1 baseband is NOT unlockable !!!

[joecef]

Not that its really relevant but Simple Mobile doesnt require unlock