Hello everyone! 

I have a question and I hope you can help me.
I have an iPhone 3GS, 4.2.1, 05.15.04 and I want to unlock it.
I am planning to backup all my files with iTunes, then jailbreak it and the unlock it with RedSn0w.
I understand that this will change my broadband to 06.15 and the risks.
My question is:
If something goes wrong with the Jailbreak and I need to reinstall the stock firmware using the iTunes backup, will I be able to bring back my iPhone to the same state before jailbreak (including broadband 05.15)?
I have read that after installing RedSn0w the GPS might now work properly.
Thanks a lot for your help!



I have a question and I hope you can help me.
I have an iPhone 3GS, 4.2.1, 05.15.04 and I want to unlock it.
I am planning to backup all my files with iTunes, then jailbreak it and the unlock it with RedSn0w.
I understand that this will change my broadband to 06.15 and the risks.
My question is:
If something goes wrong with the Jailbreak and I need to reinstall the stock firmware using the iTunes backup, will I be able to bring back my iPhone to the same state before jailbreak (including broadband 05.15)?
I have read that after installing RedSn0w the GPS might now work properly.
Thanks a lot for your help!