Downgrading from iOS5 beta..?!

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clicknz

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#89031 25-Aug-2011 12:47

Hi - any advice appreciated (cross posted on iPhonewzealand site). I've got an iPhone 4 running the latest iOS5 beta which I'd like to downgrade to iOS 4.3.3. I've read reports that this should be possible (but maybe on earlier betas & maybe Apple has stopped signing 4.3.3 recently...?).

I'm on a Mac & I've got the 4.3.3 IPSW. Have tried straight 'option click & point at IPSW' on restore button in iTunes 10.5 beta and iTunes 10.3 plus tried this while phone is in DFU mode - get the message 'this device not eligible for requested build'.

Tried running TinyUmbrella while doing this and it seems to get past the 'checking with Apple' phase, but then stops with either a '1600' or '20' error message... but I don't really understand what TinyUmbrella is doing, or if I'm using it correctly, and the shsh blobs are not stored for this phone.

If anyone has any suggestions I'd appreciate it. TIA.

Cheers,
Mike

Photographer/Videographer clickmedia.nz

konfusd

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#511811 25-Aug-2011 13:08

I know that the iOS5 beta side of it may open a can of worms (I'm not too sure about that as I'm loving beta6) but you won't be able to downgrade to 4.3.3 if you don't have the shsh's saved. TinyUmbrella can't get around this as all it does is save the shsh blobs from Apple by spoofing the request iTunes makes when verifying the ipsw.

Apple only signs shsh blobs for the current iOS build, with the exception of a 24(ish?) hour window when a new one is released. Have a look in the log section of TinyUmbrella - when you click the save shsh button it will attempt to download each one from Apple (or Cydia, but that can be a bit flakey and only works if they've already saved it) that is relevant for the device. It will clearly state which iOS builds you can restore to (ie the ones where it successfully saved the shsh blobs).

Hope this clears up at least part of your issue!

Edit: AFAIK they're up to 4.3.5

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clicknz

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#511846 25-Aug-2011 13:45

konfused - thanks for taking the time to reply, that helps me understand a bit more in the tangled web of iOS. I'll try a few more options, but may have to settle for iOS 4.3.5. If anyone else has any ideas I'd love to hear them....

Cheers,
Mike

Photographer/Videographer clickmedia.nz

djpaubes

394 posts

Ultimate Geek

#515048 1-Sep-2011 13:32

I cant even roll back to 4.3.5 at the moment..

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djpaubes

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#515339 1-Sep-2011 20:56

Only way is up I think, thats what I did in the end.

boby55

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#515345 1-Sep-2011 21:01

You can still downgrade to 4.3.5 as it is still signed by apple. You need to put your device in DFU mode tho to do so. ( I did this on my iPhone 4 Tonight from iOS 5 B7)

4.3.3 isn't signed anymore so unless you have your SHSH blobs you're most likely out of luck sorry

djpaubes

394 posts

Ultimate Geek

#515406 1-Sep-2011 22:37

I might restore as my contacts are screwed