May i Update iOS in iPhone 5 bypass?

I have iphone 5 ios 7.0.4 bypass. I got an update notification at my iphone.
Can i update my iphone to ios 8.4?
If i can, should i bypass my iPhone again?

Someone please tell me if you had an experience about this

You can't. You can only update to the latest version of the operating system. Currently, it's iOS 9.1.

Yes, you may update it if it supports and do install Leo Privacy Guard in order to secure your important apps from others.