From what I have gathered,this RM is what determines my update eligibility correct? Recently att has unlocked my device and I chose to use PFD with the OS version being 8.10.14219.0 with my T-Mobile sim(I prefer their data over att), I tried with and without pfd active to receive the official Lumia denim update,can't find it. If att does release the update will I still be eligible even though I no longer use them, its confusing because im on tmobile but the rm being att has to be the one to trigger official updates correct?