I purchased a Nextbit Robin from a seller about a year ago and it shipped unlocked (every time you turn it on/restart it there's a black caution screen that states the device has been tampered with and it is unlocked), the phone boots up fine after the warning and I like the phone so far, bought it because i wanted a decently powerful phone for a budget that i can use on my carrier network Metro PCS (T-Mobile). Since I got the sim and activated it works fine but I want to use G Pay and other NFC services that require that phone wasn't "tampered" with. I'm a little confused on how to do this successfully and correctly. Is there a way to "re-lock/Lock the phone?. Does it interfere with my sim/data/cell service? will it wipe everything on the phone?
There is a lot of confusing info out there on how in great concise detail.
Basically I'm asking for some help on doing this because I really want enable G Pay, Can anyone give me me a super detailed and technical step-by-step on how to do this SAFETY without bricking my phone? Which "ADB" should I use? What do i need beside the stock image (N 7.1.1) and the USB driver? Any other programs? I'd really appreciate it thanks a bunch!