Iphone 3GS and new update os4

[hybridge]

I have 3GS unlocked running 3.1.3(5.12.01) with tmobile. The screen is messed up right now so I want to restore but it will update to os4. Will I be able to uplock it again if I take the update? Thanks for any help.

 

[Alonzo84]

There is no jailbreak for iOS4.0...yet.

 

[hybridge]

thanks Alonzo

 

[Alonzo84]

thanks Alonzo

I do believe there are ways to revert back to the previous OS in case restoring your phone is the only fix. I am not familiar with them but you can try a forum search.

 

[MBHockey]

I do believe there are ways to revert back to the previous OS in case restoring your phone is the only fix. I am not familiar with them but you can try a forum search.

The issue is the baseband would be upgraded regardless of him reverting back to OS 3.1.3. The newer baseband isn't unlockable yet on the 3GS

 

[hybridge]

Thanks MBHockey and Alonzo. maybe I should sit tight and wait for ios4 jail break.

 

[hybridge]

One more question guys, can I reverse to the older factory firmware like 3.1.2 or even 3.1.3 instead of ios 4 to try to fix the messed up screen that I have?

 

[phrint]

There is a jailbreak for iOS 4.0 but you need to have a 3GS with the old bootrom (non-tethered jailbreak) and have not used the Spirit jailbreak. Here is the linky:

http://blog.iphone-dev.org/

I am anxiously awaiting to jailbreak my iPhone 4...

 

[phrint]

One more question guys, can I reverse to the older factory firmware like 3.1.2 or even 3.1.3 instead of ios 4 to try to fix the messed up screen that I have?

You cannot downgrade to 3.1.2 unless your hashes on Cydia show they are stored for 3.1.2. You can go back to 3.1.3 as Apple's servers are still authenticating. Check Cydia to see if your hashes are saved on their server for 3.1.3 and you can still go back and jailbreak. There was never an unlock for 3.1.3 so I am not sure what version you are on. 3.1.2?

 

[hybridge]

thanks phrint. How can I know if I have old bootrom?

 

[phrint]

thanks phrint. How can I know if I have old bootrom?

I guess my question to you is are you using a factory unlocked device or have you jailbroken it and unlocked it through a hack?

Try this part of the forum if you are jailbroken:

https://forums.macrumors.com/forums/105/

There is some good guidance in terms of jailbreaking/unlocking here. My advice to you is that if you are currently jailbroken and you do not need to connect to your PC/Mac every time you re-start the phone then you have the older bootrom.