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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > iPhone ,iPod & iPad (Apple Inc. Products) > iPhone 4 / iPhone 4S

iPhone 4 / iPhone 4S iPhone 4 / 4S

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Old 03-09-2012, 11:23   #1 (permalink)
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How To Downgrade iPhone 4 iOS 5.1 Baseband 4.12.01 to 4.11.08 And Wait For Unlock [Gu


Apple’s major iOS 5.1 update which was released on March 7th alongside the new iPad also brought two new basebands. These new basebands are not going to hurt people who have factory unlocked iPhone 4 or iPhone 4S but people who rely on iPhone unlocks can put themselves in a big trouble by updating their iPhone to iOS 5.1. We have already warned people who rely on unlock to stay away from this update but some people don’t know the consequences of this specific iOS update. Though it will effect both iPhone 4 and iPhone 4S owners but people who have unlocked iPhone 4S with Gevey Ultra S, TP SIM or R-SIM could get in to more trouble than iPhone 4 owners. Once you update your iPhone 4S to iOS 5.1 you will not only loose your iOS 5.0.1 untethered jailbreak but you will also loose your iPhone 4S unlock because no solution has been updated to unlock iPhone 4S’ new baseband 2.0.10.

If you have an iPhone 4 (carrier locked) and you’ve upgraded to iOS 5.1 then the damage has already been done. You have updated your iPhone 4′s baseband to 4.12.01 which is not unlockable. You cannot go back to any unlockable modem firmware of iPhone 4 like 1.59.00, 2.10, 3.10 or 4.10 but there’s still a hope for you guys to go back on iOS 5′s baseband 4.11.08, there’s no unlock solution available for baseband 4.11.08 (as of this writing) but there’s a hope for 4.11.08 unlock because all dev teams and hardware unlock manufacturers are working on an unlock solution. Baseband 4.12.01 on the other hand is a new baseband and developer are not familiar with it right now. So there’s a good chance that you will get your iPhone 4 baseband 4.11.08 before than baseband 4.12.01 unlock.
You can downgrade your iPhone 4′s iOS 5.1 baseband 4.12.01 to 4.11.08 and wait for unlock which is the best option available right now. You must do it quickly because Apple will stop signing iOS 5.0.1 any moment and you won’t be able to downgrade your baseband after that. If you think “something is better than nothing” then get your iPhone 4 back on iOS 5.0.1 (baseband 4.11.08) and wait for an unlock.
Note: The window of baseband downgrade is very short you must do it ASAP.
How To Downgrade iOS 5.1 Baseband 4.12.01 to 4.11.08:

Things you will need during this process:
Step 1: Connect your iPhone 4 to computer via USB cable and make a back up of your data (recommended)
Step 2: Turn off your iPhone and put it in DFU mode
To enter DFU mode:
  • Hold Power and Home buttons for 10 seconds
  • Now release the Power button but continue holding the Home button for 10 more seconds
  • You device should now be in DFU mode (black screen)
Step 3: Launch iTunes, it will recognize your iOS device in recovery mode. Now we’re going to restore the IPSW file which you downloaded from the link above
  • Windows users: Press Shift+Restore
  • Mac OS X users: Press Alt+Restore
Step 4: iTunes will restore your iPhone 4 back to iOS 5.0.1 and your baseband will be downgraded from 4.12.01 to 4.11.08.
This was it folks, though your iPhone 4 will remain locked but you have a better chance of getting it unlocked on baseband 4.11.08.


I found this post usefull for us ( unlockers )

so just copy/paste it / source : how to arena blog as you see in picture

my own blog is : http://smartphonologie.********.com/#axzz1oVcdKdMO
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Old 03-09-2012, 14:06   #2 (permalink)
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it's seem apple stop signed iOS 5.0.1 someone can confirme ?
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Old 03-09-2012, 14:10   #3 (permalink)
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Yes, I can . Aplle stop signing 5.01 now, and you can't downgrade your phone .

Do not ad your blog, your choose a wrong place fot that !!
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Old 03-09-2012, 14:26   #4 (permalink)
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I think baseband can't be downgraded simply by selecting firmware with lower baseband...
2 "i was ban": good nick
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Old 03-09-2012, 14:44   #5 (permalink)
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Donate money to this user
Now apple not sign 5.01 fw
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Old 03-09-2012, 14:48   #6 (permalink)
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sorry admin

Quote:
Originally Posted by ribbentrop View Post
Yes, I can . Aplle stop signing 5.01 now, and you can't downgrade your phone .

Do not ad your blog, your choose a wrong place fot that !!
that's bad if apple Stoped iOS 5.0.1 signature
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Old 03-09-2012, 14:51   #7 (permalink)
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Quote:
Originally Posted by Dr_Wolodya View Post
I think baseband can't be downgraded simply by selecting firmware with lower baseband...
2 "i was ban": good nick
It was possible yesterday, but now Apple stoped it .
Wanna proof ?
http://i32.fastpic.ru/big/2012/0309/...df3a4e2a38.jpg
http://i32.fastpic.ru/big/2012/0309/...4b6025872a.jpg
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Old 03-09-2012, 14:54   #8 (permalink)
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great your your proof ...
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Old 03-09-2012, 15:14   #9 (permalink)
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not work sir.. 3194 with/without host modified with itunes 10.6 or older.. not downgrade 5.1 to 5.0.1 and not write custom 5.0.1 to iphone with ios 5.0.1
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Old 03-09-2012, 15:16   #10 (permalink)
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Quote:
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yesterday yes was possible, today no...
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Old 03-10-2012, 06:52   #11 (permalink)
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agree with you_________________
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Old 03-10-2012, 12:17   #12 (permalink)
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yes Confirmation and most detail here
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