Downgrading 3.1.3 to 3.1.2 and FIXING the No Service issue.

[iYeow]

will this "unlock" the iphone?

I have managed to downgrade from 3.1.3 to 3.1.2, but it is still on the 05.12.01 baseband.

There is no point downgrading from 3.1.3 to 3.1.2 and you should know by now BB 05.12.01 cannot be unlocked nor be downgraded