Jailbroken iPhone 5, won't boot after upgrade to iOS 7

[umiwangu]

My iPhone 3GS is dying (it's an early 2009 model, so I've been expecting it). I'm trying to decide what to upgrade to. I found an iPhone 5 on CL for $200 that has issues, but I'm wondering if I can fix them. The seller says they bought it jailbroken, but now it won't boot after upgrading to iOS 7. Is this fixable at all? I've had some experience jailbreaking my 3GS, so I know it's pretty dumb that they upgraded to 7, but I'm assuming there has to be some way to get it going again. The seller sounded like they didn't have any experience jailbreaking.

Thanks in advance!

 

[NnUuLlLl]

The problem isn't a jailbreak! All evidence of jailbreak is completely removed during a iOS restore or update. Did the restore and update process complete successfully? If it did it sounds like a hardware issue.

 

[bemental]

Did you update the device in iTunes? You'll be unable to restore it to a previous version of iOS since the signing windows are dubiously closed.

If you merely did a hardware "Erase All Content and Settings" that is definitely not enough since this is designed to fail so people do not unintentionally remove their jailbreaks.