Originally posted by MexiMoDz
Version 9.3.1 dont had updated it because i know the newest firmware isnt jailbreak able.. iphone 6s
If you do a factory reset through iTunes, you can keep your firmware but you will lose everything else. That way, you can jailbreak it again. Although, when it asks you to update the firmware on your iPhone, make sure you hit Cancel and not Update, otherwise you won't be able to jailbreak.