I need how to update my ZTE Pro Max

You can only 'update' a device if there is an 'update' showing in the phone's "Settings". If there is nothing showing in there, then there is no 'update' for your phone. Getting and installing anything else would not be an 'update' but changing the phone, which would require things like rooting. Which I cannot help with.

If that is what you are trying to do, please then post in the "Rooting, Jailbreaking & Unlocking" forum. http://www.tomsguide.com/forum/forum-117.html