3GS 4.2.1 5.15.04 bb downgrade/jailbreak/unlock

[cbincle]

hi...
i need to unlock my 3gs, currently atr 4.2.1 5.15.04 bb.
don't want to go to the 6.15 bb and experience gps issues.
is it possible to downgrade to an earlier version of ios and jailbreak/unlock from there? if so, how?
tia,
cbincle

[Ramikey]

Want to know the same thing but on a 3G 4.2.1 jailbroke using redsn0w still have a bb of 5.15.04 I want to unlock but can't how long till ultrasn0w updates to that BB have battery issues also

[Kioes]

You cant yet downgrade the BB musclenerd has found a way but it isnt publicly released yet from my knowledge, so either you have to use 6.15 or what for the BB downgrade system.