I purchased a Lumia 930 (Black/Gold) from Amazon a few weeks ago. Yes, it was RM-1045_1044, 000-HK. After changing it to US region and English, I updated it with Windows Insider to the 10166 W10 build. I was having problems with overheating and wanted "Hey Cortana", so I decided to throw caution to the wind. I flashed it to the GB 059W004 product code. Voila! After reinserting my AT&T sim card, and changing language to US English, I now have Denim and "Hey Cortana" on my 930, running on AT&T. Everything seems to work great. Now it shows as RM-1045_1003, 000-GB.