Downgrade iPhone 3GS 6.1.3 Firmware to 4.1 Without iOS SHSH Blobs @pmbonneau
Downgrade iPhone 3GS 6.1.3 Firmware to 4.1 Without iOS SHSH Blobs  @pmbonneau
Uploaded February 2014 | Updated September 2026, 9 minutes ago
Please read carefully this description before doing anything!

In this video, I'm downgrading my iPhone 3GS (MC Model, new bootrom) 6.1.3 firmware back to 4.1 without using SHSH blobs. Apple still sign iOS 4.1 for some old iDevices (iPod Touch 2nd, iPhone 3G and iPhone 3GS as I know) thats why this downgrade does not needs SHSHs. Apple use another downgrade restriction, which is the Baseband version. When you do an iDevice restore, in most case, the baseband can not be rolled back and the restore will fail if your current baseband version is higher than the one of the iOS version you want to downgarde to. Thats why we have to trick the iPhone by upgrading the baseband to iPad 6.15.00 and then, downgrade it back to 5.13.04, so iOS 4.1 firmware will install 5.14.02 baseband without problem.

Videos to see before doing anything, if your iPhone baseband is higher than 5.14.02:

First, upgrade your iPhone to iPad 6.15.00
youtube.com/watch?v=7ZczdJoBCCo

After, downgarde it back to 5.13.04
youtube.com/watch?v=DMrz-NdOfSI

Finally, do the downgrade like in this video.

I AM NOT RESPONSIBLE OF WHAT MIGHT HAPPEN TO YOUR IPHONE BY FOLLOWING THIS TUTORIAL.
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Pierre-Marc Bonneau |

Downgrade iPhone 3GS 6.1.3 Firmware to 4.1 Without iOS SHSH Blobs

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