Can't watch videos or open safari on my iPhone! - 2

A while back I jailbroken my iPhone with cydia. Then my iPhone died and I can't open cydia. Then I noticed that I couldn't watch videos at all on my iPhone and safari won't open! Someone please help I need to uninstall cydia or something but don't know how! I can't do a ISO update right now because no Wi-Fi.
Also already tried to reset settings! I Tried everything I could think of! I don't want te Delete all my apps and music either.

The jailbreak on your iPhone is a TETHERED jailbreak, what that means is that, if you iphone happens to restart, it will lose the jailbreak data.

So all the app associated with it, mail, safari, etc. Will be affected and cease to work.

What you need to do is plug it into your PC and do a Restore in iTunes. If you don't know how to do that, there are plenty of tutorials on youtube to show you.

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