Chosen Solution

My OnePlus 2 WiFi & Bluetooth, as well as internet and front buttons not working. What is problem? Hardware or software. How to solve this problem?

Well firstly I would start with the software side as it not going to cost you anything to check.. We all know how software works especially updates lol it will leave you broken if corrupt. Dan is right in terms of knowing more as you could have liquid damage, board damage etc