iPhone 3G iOS 4.1 bb 5.13.04, need help on how to downgrade

[Melani_Anne]

Hello. I'm writting this post because I can't seem to find my answers anywhere. I have an iPhone 3G on iOS 4.1 with baseband 5.13.04 and bootloader 6.4 on t-mobile sim. My question is, if I downgrade to iOS 3.1.3 will it upgrade my baseband to 5.14.02? I tried saving the shsh blobs with tinyumbrella but the tss server is not working so I'm afraid if I ran the iOS 3.1.3 without the shsh's it will upgrade the baseband. I've also tried sn0wbreeze, but it's only for 3.2.2/4.1. If anyone could help me out it would be much appreciated. Thank you

[Simon]

So you must have used a custom firmware to get to 4.1 and keep that baseband right? You dont need SHSH to download to 3.1.3 on a 3G and no your baseband will not be updated if you do (only if you try to restore to 4.1 will your baseband be updated). You will probably get a error 1015 when trying to restore to 3.1.3, do not panic, just use tiny umbrella to exit recovery and then you can use redsn0w 0.9.4 to jailbreak.

[iSOD]

I just want to downgrade my 3G from iOS 4.1 to the former iOS 4.0 for example. How can I do that?

[Simon]

If you have SHSH for 4.0 then you can use tiny umbrella to help you downgrade to 4.0. Or if you want to go lower you dont need SHSH for a 3G for 3.1.3 and below. You would just have to download the firmware and shift-click restore to it in itunes. You will get an error 1015 near the end of this process just use tiny umbrella to kick it out of recovery.

[A3gOwner]

I used sn0wbreeze on mine to update to the 4.x series just to save shsh's so I have them. On the 3.x software just restore the apple official software n jailbreak with redsn0w like mentioned above. As for the 1015 error I never had an issue with it. I think it more for newer gen phones/touches. I personally use 3.1.2 idk y but I like the way it runs better than 3.1.3.

[Simon]

The 1015 error is if you have a higher baseband and try to restore to a lower firmware (only applies to iPhones not iPod touches). Since you used a custom firmware you wouldnt have that error as the baseband is taken out.

[Melani_Anne]

Ok, I'll do it. My husband is bugging me cuz his phone is running so slow with 4.1. I bought it that way so I wasn't sure if I had to do all that shsh stuff. Now that I know I'll downgrade. Thanks!