Can't get Cydia working on my phone?

I have a iPhone 6s Plus with iOS 9.3.3 and I jailbroke it with Pangu Semi Untethered Jailbreak. I lost my phone and recently found it. Now I can't open up the app to re install the jailbreak and I accidentally deleted it. Now whenever I download the jailbreak for the no computer version it keeps saying not working retry. Please help me with either re downloading Pangu or remove Cydia.

Ryuhfg

Apple has repeatedly fixed jailbreak exploits with successive updates to its mobile OS, so you will usually have to pause automatic iOS updates to apply a jailbreak.