How to fix my iPhone? (Jailbreak)?

Basically I jailbroke my iphone 4 with semi untethered, on iOS 6.1.3 and tricked it to a 6.0.It had worked absolutely fine (for maybe 2 months?) and then I go to use it later in the day and it wasn't on. I turned it on and then after 10 seconds of showing the apple logo it turned off. I tried to restore but had the error 3194 and 1600. WHAT DO I DO? I've tried changing the hosts and everything but I think the problem is that it fails to boot.

Try putting it in DFU recovery mode, it'll update you to iOS 7 tho

First tray put iPhone to recovery mode
http://ihash.eu/how-to-put-an-iphone-into-recovery-mode/

then if is not working try DFU mode
http://ihash.eu/how-to-put-an-iphone-into-dfu-mode/

Here you can find all iPhone firmwares
http://ihash.eu/where-to-download-iphone-firmware-files-from/

You should be able to boot it without a restore.

If you use the tool you used to jailbreak (maybe RedSn0w?) there's a boot tethered option. This will get you back into the phone.

If that doesn't work, you are out of luck and need to restore in iTunes which will force iOS 7.

You can check for the RedSn0w software and jailbreaks here; http://www.isthereajailbreak.com/