How to Jailbreak and Unlock Your iPhone 3GS Using RedSn0w (Windows) [4.2.1]

During
this process you can update your baseband to the 06.15 version. If you
are on 05.14 or 05.15 or higher you will need to do this to unlock. You
do not need to do this for jailbreak only. Please read the following
very carefully before deciding whether to do this. You can find out
baseband version here.

1. There is no way to come back down from 06.15, and there’s no hiding
the baseband version from Apple. You’ll be voiding your warranty in a
very obvious way.
2. If some future baseband comes out with a critical fix, you won’t be
able to update to it if it remains down in the 05.xx sequence (then
again, you wouldn’t update to it if you wanted to keep your unlock
anyway).
3. Starting with FW 4.2.1 if you have 06.15 on your iPhone you won’t
ever be able to restore to stock firmware (it will fail). You’ll need to
only restore to custom IPSWs (then again, if you’re unlocker you should
already be doing that).
4. There are reports that 06.15 may disable your GPS. The iPhone Dev-Team is currently working on a fix.

Don’t update to 06.15 if you don’t need to! Only do this if you need the
unlock and you’re stuck on 05.14 or 05.15, and you’re willing to assume
the above risks.

check link here.
[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذا الرابط]











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