How to upgrade my jailbroken iphone 7.0.2?

So i have an iphone 5, version is 7.0.2, jailbroken.
i want to upgrade it since many games these days doesn't support my version like Modern Combat 5 or Dungeon Hunter 5 etc, but the problem is when i go to Software Update it searches but nothing shows up even after left for some minutes.is there any way i can upgrade it another way? I want to keep my files/apps etc though. I'm not surr i kind of heard u lose all your stuff like contacts or viber/line msgs, is that true? I'm just a noob, some help would be really appreciated! >

When you jailbreak a device you gave up the rights and ability to upgrade.
They did not mention that to you did they… Enjoy what you have.

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