UPDATE: Everything is working fine with the SIM chip in. I have LTE speeds (shown as an "L") and the AT&T entry is showing in the store (I'm using a GoPhone chip). Lumia Pusher isn't available, which is a bummer, but you can/should update your system apps by going here:
system apps | Windows Phone Central . No complaints so far!
I've been working on this all afternoon and finally have the GDR2 and Amber update on my unlocked AT&T 920. Still setting it up and will pop in my SIM chip soon. Between this thread and VegaNovus' thread (
http://forums.windowscentral.com/no...ia-lumia-eu-rom-gdr2-amber-download-link.html), I was able to get it installed.
1. Install the "hacked" version of the Nokia Care Suite (NCS) ... keep it in offline mode
2. The pre-Portico Rogers ROM (from here [message #52]:
[FLASH] How to use NCS to change from RM-820 to RM-821 and vice versa - Page 6 - xda-developers) switched my 920 from AT&T to Rogers but wouldn't let me install the RM-821 Euro ROM so I upgraded the phone to the post-Portico (?) Rogers ROM (1232.5962.1314.0000)
2a. You can either do this on the phone (after flashing it) or just direct-download the updated ROM via NCS and install it that way
3. After it installed, and without setting up my Live account or anything, I did a factory reset and then used NCS to install the RM-821 Euro ROM (found here:
http://forums.windowscentral.com/no...ldnt-download-amber-euro-dev-rom-059r4h6.html)
4. The upgrade worked and I did another factory restore, just to be safe
Matt