iPad 3 - need advice
I have ipad3 (wifi/4G) which has ios 5.1.1. Due to little mishandling, I have got my jailbroken iPad messed up and now safari and mail is not working. I have tried several options, hard reboot, rest through iTunes, ...but none of them worked. Whenever I tried for any of the method the apple logo appears and would never go till the battery drains out. Then I put the device on charging and it comes to life. This is how I am managing with my device now. I have my blobs saved as well. Can I go for a reinstall of its 5.1.1. I don't want the latest 6.0.1 as there is no jailbreak for it yet in the market. I badly need Cydia and the only solution in my view is to go for a fresh install of ios5.1.1 and then jailbreak it. Please help.
At present, there is no way to reinstall iOS 5.x on a CDMA iPad2/3/4. The baseband signing causes all restores to fail. I'm in a somewhat similar situation where I want to be able to restore 5.1.1, I have a CDMA iPad2 upgraded to 6.0.1 (as I had SHSH including APticket and thought I could downgrade with tinyumbrella), but unfortunately it's not possible. Even with an iPad2 CDMA and 4.3.3 SHSH (which didn't include the APticket nonce for the baseband), you can't complete the restore in recovery or DFU mode -- it always kicks out with either -11, -20, or 1600. It seems that the CDMA iPad models just do not have the same downgrade possibilities due to the baseband signing.
Having the CDMA baseband in your iPad makes downgrades a fairly fruitless effort at this point. I hope that there is a solution in the future (I really miss RetinaPad, frankly), but don't think that we'll see something that solves this problem any time soon, it's been a problem since 4.3.x stopped being signed and they haven't solved it yet...
I hate to say that I do not believe there is any way you can restore 5.1.1 to the device at this time. Can you elaborate on what you may have done that could have caused the problems you're experiencing? It's far more likely we can identify the actual issue that caused this and fix it than it is that you will be able to restore a 5.x iOS now that Apple is no longer signing them or the basebands for them.
Pls share what is CDMA! Actually I did too much fiddling with my device after the jailbreak, installing various apps, then deleting them and so on. Thus there came a stage when device got slow down but was working well anyway. I had not inserted the sim yet and just took my device to a semi skilled guy who used to sell sims. Handed over my device to him to insert the sim and activate it. But somehow after he inserted the sim, it didn't work. What this guy did then.....a hard reboot..and that's all. After that the apple would continue to appear and would never vanish whatever we do. So this is how I spoiled my device. Looks like upgrading to ios 6.0.1 is the only solution left for me.*
But to share a little about restoring to iOS 5.1.1, *it is possible if you have upgraded from lower versions or your device came from the factory with any version less than 5.1.1. However if the device came from the factory with its 5.1.1 (as in my case) or it has been upgraded to 5.1.1 through OTA.....it's almost impossible.*
Apologies, I mentioned CDMA when the issue at hand (and your iPad) are not CDMA specific. CDMA is another wireless technology like 3G. It would have been more proper for me to say that 3G enabled iPads (whether they are CDMA or not) cannot be downgraded at present.
In my case, even though I have an SHSH for 4.3.3, I cannot downgrade to it on my iPad2 as the baseband portion of the restore always fails. Unless they find a workaround for this issue, I do not believe that downgrading will remain viable for 3G/CDMA equipped iPads in the future, unfortunately.
The 'qualified SHSH' stipulation (the OTA vs non OTA SHSH saving) still only applies to the non-3G / non-CDMA iPads, as far as I can tell. The last jailbreakable revision of iOS that could successfully be downgraded on the 3G/CDMA iPads (and even then only when basebands compatible with the revision were being signed by Apple) was 4.3.3. Unfortunately, even with SHSH for 4.3.3 today, the iPad will not complete a DFU restore with TinyUmbrella running.
In my case, I never did OTA updates and have full and valid SHSH for all 4.x iOS revisions, and according to TinyUmbrella & redsn0w, full and valid SHSH with APTicket for 5.x -- still can't downgrade my iPad :(.
If the iPad is just bootlooped, try plugging it into the computer, running TinyUmbrella, and hitting the Fix Recovery or Exit Recovery buttons. Those can sometimes resolve bootloops. Alternately, ensure it's plugged into your computer when you power it on. I've had instances where I set my iPad to restore from backup, it power cycled, and didn't properly reconnect to the computer. Unplugging it and replugging it, then rebooting the iPad solved the problem for me in that case.
I will try once to do the way you told but honestly bit scared as once my device gets stuck in boot loop as you call it, it's really hard to bring it out of it. Sometimes it takes days to get rid of the apple logo. Thanks for your input anyway.