re: Does anyone know if and how I can revert my AT&T 920 back to Black from Cyan?
I don't think AT&T is behind it. I upgraded a 925, and 820 and they both still have internet sharing after they were updated by AT&T. Also two 520's that have had no problems at all. In fact the only phone I have had problems after updates is my Moto G lte when it was updated to KitKat 4.4.4. While I have no love for AT&T (I moved all our phones to Consumer Cellular) they have taken care of updates better than any of the other providers. Look at Verizon and the crap they have pulled, and T-Mobil is only a little better. You could have a Icon that Verizon just told all those customers to go to hell, do not pass go do not collect 200$,