don't know where or from whom you got your phone, but here's the situation you are in:
***LOCKED***
M7DUG PVT SHIP S-OFF RH <--- S-Off, only in a very few and rare situation would a phone come S-Off
CID-11111111 <--- SuperCID, somebody did that!!
M7DUG <--- that's the Dual SIM, right? so don't go messing around with M7_U and M7_UL versions, they are DIFFERENT
so to put it mildly, your phone was used by someone before you, and is not "out of the box". and you will not get any OTAs unless you're 100% stock.
Thanks for the reply. Just a few questions:
1. What do you mean by "SuperCID"? Is it a good thing or a bad thing?
2. Yes, the phone is dual sim, and if what you said is correct, OTAs are out of the question. So if I just want to update my Android 4.1.2 to 4.2.2 (and hopefully HTC Sense as well), what are my options? What about upgrading with RUUs?
3. Yes, I got the impression that my phone was used by someone before me, as even though it has the Chinese bloatware, it does not have HTC Marketplace App or most of the Google apps but strangely has the Play Store app. Weird.
4. How can I "unlock" my phone? Or more specifically, what are the restrictions on a "locked" phone and what are the benefits of unlocking?