posted a bizarre answer to repair the difficulty. He writes:
I've an iPhone four and that i did jailbreak with Pangu. I've bootloop everytimes i attempt to restart my telephone.It definitely sounds loopy, however quite a lot of customers on the reddit thread have confirmed that the answer does certainly work. Apparently, based mostly on the responses within the reddit thread, it seems to be like the difficulty is affecting fairly a number of iPhone four customers.
I KNOW THIS SOUND CRAZY, however it looks like a bug brought on by mild sensor. In case your telephone is in the dead of night you'll get caught within the bootloop. For those who level a flashlight above the sunshine sensor, boot goes nicely. This additionally works in case you get caught on “Pangu welcome display”.
This is the best way to repair it:
You possibly can comply with our guide posted here on easy methods to jailbreak your iPhone operating on iOS 7.1/7.1.1 utilizing Pangu untethered jailbreak device.