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I am trying to downgrade to ios 4.3.3 but each time I try this, my iPod Touch 3g goes in a recovery loop with an all black display and I can't do anything but restoring ios5.

Is it possibile to downgrade to 4.3.3?

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If you have your SHSH's saved for 4.3.3, then you should be able to get back to 4.3.3 with some help of TinyUmbrella (it also has a button to get out of recovery loop, maybe you can try that?)

If you don't have your SHSH's saved, there is no way you can get back to 4.3.3 (or any firmware version for which you didn't save your SHSH's, for that matter...)

Official download links are to the right of this page:

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I don't have shsh saved, but some days ago i was successful to a restore of ios 4.3.5 =/ the problem is that i need unthethered ios 4.3.3 – dynamic Nov 12 '11 at 14:16
you might want to try this:… – vrwim Nov 13 '11 at 15:30
@yes123 you were only successful in restoring to 4.3.5 because Apple was still signing that firmware revision. They typically sign the immediate old one for a week or so after a new release. After that point, you'll need to have your SHSH blobs. – user10355 Dec 13 '11 at 5:19
@cksum: understood :( – dynamic Dec 13 '11 at 10:28

You cannot get back to older iOS versions because Apple no longer signs them digitally. The only way to get back further than the ones they're currently signing is using TinyUmbrella where it will sign the package for you.

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