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How to Unlock iPhone 4 on iOS 4.3.5 Using Ultrasn0w 1.2.3?

Hi all, I am trying to jailbreak and unlock my iPhone 4 on iOS 4.3.3. But I have accidentally restored it to iOS 4.3.5. Can I downgrade it to iOS 4.3.3 and unlock it using Ultrasn0w? Any help would be great!

Asked by: Richelle from Leeds, West Yorkshire UK

Hello Richelle, you will only be able to downgrade the firmware version of your iPhone, if you have saved the SHSH Blobs of your deice using TinyUmbrella, iSHSHit, or iFaith tool before restoring it to iOS 4.3.5 firmware through iTunes.

MuscleNerd of the iPhone Dev-Team tweeted that iOS 4.3.5 can be jailbroken using Redsn0w by pointing the tool to iOS 4.3.4 instead of iOS 4.3.5. You can check this blog post on how to jailbreak iOS 4.3.5 with Redsn0w 0.9.8b3. However, you should be note that Redsn0w offers tethered jailbreak only.

Anyway, regarding unlocking, since you have already restored your iPhone to stock iOS 4.3.5 ISPW file, you will not be able to unlock your iPhone using Ultrasn0w as the baseband of your device has been upgraded and there’s no way that you can downgrade it.

Optionally, you can use Gevey SIM Pro to unlock your iPhone. Yes, Gevey SIM is working smoothly on iOS 4.3.5. If you aren’t familiar with the steps, then you can refer on this guide on how to unlock your iPhone on iOS 4.3.5 using Gevey SIM Pro.

If your device is locked to O2, then you can request to O2 staff to unlock your device. To do that, all you have to do is fill up this O2 unlocking form and wait for their confirmation.

Unlock iPhone 4 from O2

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