iPhone 5s won't boot please help!

[arch2301]

Hi, I bought a used iPhone 5s about three months ago, it has worked great and had no problems. A day or so ago I shut it down completely when I wen't to sleep. When I tried to turn it on in the morning it showed the apple logo for about 10 seconds then crashed. I tried restarting several times, I tried resetting (holding power and home) and still nothing has worked. I eventually connected to iTunes to try to update/restore, which worked at first but part way through the phone disconnected and the process was canceled. I tried several more times and it always disconnects at the same spot. I would rather not have to get a new phone and I didn't have it backed up either so any help I can get would be greatly appreciated.

 

[C DM]

Have you tried using recovery mode? https://support.apple.com/en-us/HT201263

 

[arch2301]

Yes. I have tried this several times but it doesn't work. When I press the two buttons the screen just goes black and disconnects from the computer.