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Please could you guide me in upgrading to iOS version 5.1 from current 4.1 version on already jailbroken & unlocked iPhone 3GS on baseband 06:15:00?

I read many posts here but couldn't find consolidated steps to achieve this. I think, baseband needs to be downgraded and then iOS version need to be updated but what is the order of steps and tools that should be used.

I wanted to upgrade to new iOS version to access newer apps but still have my phone unlocked for usage with my carrier.

Please help me out.


asked 05 Jan '13, 07:15

iPhoneUser's gravatar image


first look what it's your SHSH from cydia u can see it. if there is iso 5.1 than u can upgrade

(05 Jan '13, 07:27) manothbi manothbi's gravatar image

i face the same issue, am on iOS 4.2.1 and BB 6.15.00 post 2013 many apps have stopped and require min iOS 4.3

is there any single step way to upgrade the iOS without disturbing messages/SMS and contacts on the iPhone 3GS.

(06 Jan '13, 01:08) adityabit adityabit's gravatar image

@adityabit, either pick one question to comment on, or create your own question. Restoring wipes the device, so you will have to backup your phone to save messages/SMS and contacts before restoring.

(06 Jan '13, 01:25) spockers ♦♦ spockers's gravatar image
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Asked: 05 Jan '13, 07:15

Seen: 1,837 times

Last updated: 06 Jan '13, 01:27

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