With the newly released of iOS 4.2.1, Apple seems to have put new trap(s) for jailbreakers and unlockers. This was recently discovered by Semaphore, the TinyUmbrella creator and the following was mentioned in his post:
“It seems that Apple has decided to put a baseband requirement on iOS. So at this point, if you are using Saurik’s server or tiny umbrella and trying to restore 4.2.1 on an iPhone 4, you will end up in recovery mode and tiny umbrella will not be able to pull you out of recovery. In this case, you will have to restore 4.1 again or you will have to restore 4.2.1 stock and be tether jailbroken. (Of course, I recommend 4.1 and not bothering with 4.2.1 at all). If you are an unlocker, this is a no brainer. Do not update to 4.2.1 even to test it at this point.”
In simpler words – if the baseband is not updated when you update your iPhone using TinyUmbrella’s method, you will not be able to kick it out of recovery mode.
However, one user commented that:
“This is false. I have successfully updated from 4.1 to 4.2.1 and retained my 1.59.00 baseband. Redirect to Cydia’s servers yourself and don’t use TinyUmbrella except for booting out of recovery mode. Make sure the service is off and your host files are redirected to Cydia’s servers. You should get error 21 if you are trying to use TinyUmbrella to restore, which will have done nothing whatsoever to your phone except put it in recovery mode, and you will get error 1013 if you do it the way I explained above, which is a baseband update error. Just use TinyUmbrella to kick it out of recovery mode and your phone will be fully functional.”
Although this may sound confusing especially for new iPhone users – our advice: Jailbreakers and unlockers especially – stay away from iOS 4.2.1 until a proper tool has been developed by these dedicated folks.
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There is no update on this issue, Can any one help, my iPhone 4g was on 4.1 / 02.10.04 and was JB but unlocked (I am from Pakistan), I was using the device as iPod touch, recently I upgraded to 4.2.1 using SHIFT+Restore in iTunes (although 4.3 is released, but I thought there might not be any JB for 4.3), but upon updating firmwar, an error pops up in iTunes showing 1013. Tinyumbrella does not work at all, it takes phone to restart, but phone shows apple logo on restart……RecBoot does not work (I have also installed LibUSB on my windows, windows in Win7). Can any one help pls.