If you have a jailbroken or unlocked iPhone, you might face this issue sometime in future. I am not saying that you will face this ‘iPhone Stuck On Apple Logo’ bug, but if you ever face it, dont panic. This iPhone getting stuck on reboot or hanging issue on Apple logo happens when you are trying to jailbreak your iPhone or after installing a jailbroken app. If this happens, you will need to put your iPhone in DFU(Device Firmware Update mode) mode which will restore your iPhone completely. Since you wont have any other option, you will have to go for this option or else your iPhone will remain in this bricked condition for ever.
This is not specific to 4.2.1 jailbreak or iOS 4.1 jailbreak using Limera1n or Greenpois0n, but a common problem that is faced after a reboot following a jailbreak or Installing a Cydua app. How to Fix the Problem:
1- Connect your device to your PC or Mac, with the latest version of iTunes installed on it.
2- Put your iPhone or iPod Touch in DFU Mode:
A. HOLD down both POWER and HOME buttons for 10 seconds.
B. Next release POWER button, but keep holding the HOME button till you see the ‘Connect to iTunes’ screen
3- iTunes will now give the message ‘iTunes has detected an iPhone in Recovery mode. You must restore this iPhone before it can be used with iTunes.’ Click OK.
4- Next click SHIFT + Restore button and when iTunes prompts you to select a firmware, browse and choose your current IPSW.
5- Let iTunes restore your device to factory settings. Later it will ask you to Choose a backup from which to restore all your settings, apps, and other data.
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