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02-24-2013, 09:51 AM #13GS old bootrom downgrade (6.1.2 -> 5.1.1) w/o shsh saved at all
Hi, as wrote on title I've an iPhone 3GS with old bootrom currently with 6.1.2 NOT jailbroken.
I read that it's possible to downgrade to any iOS version regardless of the saved shsh's due to the old bootrom.
In my case, I'd like do go downgrade back to 5.1.1 because right now, out of the blue, reboots.
I tried the procedure written on several sites: put in dfu and simply restore with iTune choosing the .ipsw prevously downloaded.
Great & simple but... it doens't work for me.
It check gs.apple.com and returns a "device not suitable to the build required".
Could you give me some hints?
Thanks in advance,
02-27-2013, 04:29 PM #2
Not true statement...bootrom old or new makes no difference...need shsh blobs to downgrade...sorry..
02-27-2013, 04:31 PM #3
Agree ^^^^ old bootrom just means any firmware you on will be an untethered jailbreak compared to new bootrom
02-27-2013, 04:31 PM #4
02-27-2013, 05:18 PM #5
Leant something new everyday thank you Simon
02-27-2013, 05:26 PM #6
Wow! When did that happen??!!
I had no idea... Been out of it for a bit since I got ip5 in dec n gave my 3GS to wife...
Last edited by xboxbml; 02-27-2013 at 05:29 PM.
02-27-2013, 05:32 PM #7
02-27-2013, 05:56 PM #8
03-14-2013, 11:21 PM #9
Indeed, I just use redsn0w to downgrade my old bootrom 3GS from 6.1.2 to 5.1.1 without SHSH/jailbreak.
A.Use Redsn0w custom official IPSW
B.Plug your 3GS under DFU, enter pwned DFU.
C.Run iTunes, restore it from costumed IPSW(NO_BB_XXXXXXX.IPSW)
04-04-2013, 07:19 AM #10
Is there a difference between using ipsw made by redsn0w and sn0wbreeze? What should be the next move? I'm kinda stuck after restore.
01-19-2014, 04:11 AM #11
I have a question about this. I followed this procedure and successfully installed iOS 4.3.3 on an old bootrom 3GS, so thank you for posting it, first and foremost.
My question is one of curiosity. What does redsn0w (or sn0wbreeze) do when it creates the custom IPSW? I know it preserves the baseband/removes baseband updates, but what else does it do to the firmware to enable it to be restored to an old bootrom 3GS vs. the stock IPSW?
01-20-2014, 07:54 PM #12
ih8Sn0w Explains SHSH Blobs and APTickets | iTweak.Tv Daily Cydia Tweak Reviews | iOS4Life
It's very informative, presented by ih8sn0w, the creator of sn0wbreeze