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05-20-2012, 02:45 PM #1Cant update to IOS 5.1 Error 21 PLEASE HELP!
So i have a jailbroken iphone 3GS
i put it into DFU mode and prepare for a shift restore, The CFW im updating to has custom stiched 5.1 blobs to it.
Everytime i try and update, It stops at "preparing to update iphone" Then i get error 21, and a Recovery loop [used tiny ireb to fix it]
My question is, How do i get around this error?
Please help! thank you so much
05-20-2012, 03:53 PM #2
05-20-2012, 04:09 PM #3
I'm think I had that error last weekend, make sure you have the very latest TinyUmbrella and Redsnow versions and start TinyUmbrella before iTunes
05-20-2012, 04:12 PM #4
Apperantly tinyumbrella is no longer valid for Restoring?
05-20-2012, 04:12 PM #5
No TSS Server is useless at 5.x
05-20-2012, 04:15 PM #6
So if im on 4.3.5 and i want to update to 5.1 (6.15.00) i can still use tiny umbrella?
05-20-2012, 04:20 PM #7
No, don't use TU.
05-20-2012, 04:22 PM #8
What should i do then?
05-20-2012, 04:27 PM #9
Try putting in Pwnd DfU Mode with redsnow
05-20-2012, 04:28 PM #10
i did, Then i did a shift restore, and i get error 21
05-20-2012, 04:30 PM #11
Pwned DfU and DFU are two different things...
05-20-2012, 04:32 PM #12
What can i be doing wrong? i have the latest redsnow, i clicked the pwndDFU mode in extras then did the shift restore, and got the error?
Last edited by Cphone 4; 05-20-2012 at 04:46 PM.
05-20-2012, 05:39 PM #13
If you are restoring to iOS5.1 which is not signed by Apple any more, i would have thought that you will still need to run the latest TinyUmbrella 5.11.0 and start its server before starting iTunes. I am on iOS5.0.1 and it worked last week, not tried 5.1.x yet though. I think if you have an iPhone 4, then you would be fine on iOS5.0.1
05-21-2012, 12:46 AM #14
Apple notes on error 21 are
iTunes: Troubleshooting security software issues
I know that when ever I install the latest version on TinyUmbrella, my firewall always asks me if I want to unblock it. You could always try turning your firewall off?
05-21-2012, 03:19 PM #15
did you guys make sure to check your HOSTS file and confirm that it is pointing to the Cydia's server to bypass Apple's authentication server?
05-21-2012, 11:00 PM #16
Tryed everything you guys sugested, no luck :c
05-22-2012, 01:31 AM #17
Have you tried stitching your blobs and a custom "no baseband" ipsw with Redsnow?
05-22-2012, 11:14 AM #18
Yes that is what I've been trying to do. Before I was just using a NO_BB 5.1, Wich gave me error 11 then I stitched and now I get error 21
05-22-2012, 11:37 AM #19
I think I would try Redsnow 0.9.11b4 and try upgrading your iOS to 5.1.1 instead of 5.1 as the Untethered jailbreak at the end of this week won't support 5.1
05-22-2012, 01:11 PM #20
Ok I will try and update to 5.1.1 since I have an old bootrom will it be unteathered? I'm on an iPad bb to
i only have a 5.1 blob so i geuss im outta luck until theres a fix for error 21
Last edited by Cphone 4; 05-22-2012 at 03:17 PM.