Got it. It's been so long since I converted I completely forgot this was a TM-AC1900 so didnt make the connection in the sticky. Thanks for the clarification and mystery solved.
I too am experiencing the upgrade issue where it uploads the firmware fine, presents NO error message and then goes back to the main page showing the previous firmware version.
-I am currently on version 384.5 on my RT-AC68U
-I tried going directly to version 384.7 with no success. After that I...