Since the ##3282 field test menu does not work on AT&T lumia 920 firmware past 1249, I have not upgraded my phone. Well actually I did, but then flashed back because I wanted the field test menu back more than anything else the update may have improved. I would like to update my phone to future ROM's but am unwilling to give up the ability to switch network speed. Has anyone flashed another ROM past 1249 meant for a different phone and/or carrier and still had full network functionality on AT&T (mainly LTE and internet sharing working) and also been able to access ##3282 field test or select network speed from cellular settings?