So I just got a Lumia 925, it's unlocked with no carrier branding. After initial setup and I was putting my apps on to it, I see some like my T-Mobile cannot be installed. I'm gunna assume that's due to region locking as it came in Spanish(mexico). Is there anyway to fix this? Flashing maybe? If so would I have to use AT&T firmware because T-Mobile hasn't released 8.1. Let me know if anybody has any ideas and if flashing is needed could you tell me what to do? I'm tech savy but, have never flashed a device.