As how is on the web, I'll stop here.
So I was replacing the screen on an IPhone 5C for a friend, but after the screen was in and working, I tried to boot up the phone, but when it would get to the Apple Logo, a bunch of boot errors would come up kinda like windows boot options. It turns out that the person had jailbroken the phone, then over the air updated IOS. This may be the cause of the problem. I've tried soft restarting, and hard restarting the phone, it will connect to my Itunes when plugged in, but when I try to restore the phone, an error comes up on my computer that says it can't reset the phone since it wont boot. If anyone knows how to fix these errors please let me know.
I'm not sure what version of IOS it was jailbroken on, or what it was updated to, although I'm pretty sure it was from 7, to whichever is current now. (I'm and android user)