Download Pan Gu Jailbreak from it's official site
This jailbreak requires nothing special but if you don't do it correctly you can face a lot of errors in Chinese, I don't really know what those letters or red question marks might means but here is some possible solutions.
1- Make sure you have the latest version of iTunes.
2- Make sure you are running pangu as an administrator.
3- Make sure you clicked pangu icon on the second page of springboard of your device fast enough.
4- Make a free space on the second page to make the pangu icon spawn on it.
5- Make sure your phone doesn't have a pin lock, if so disable it.
6- Make sure you set the date into 2/6/2014 the time doesn't really matters.
7- Make sure you hit "Trust" the computer when it asks you to.
8- Make sure your lightning cable is original and not damaged.
If all the above failed, restore your device using iTunes no matter offline or online, reset everything and try again, make sure to back it up before doing so.
I hope I helped and if you have any other possible solutions please comment below, as a lot of people are still facing problems.