E78 x11 error during read

[nmeade86]

I have 2013 RS 6 speed. hp Tuners reads the Fscm without issue, but when i try to read just the ECM, I get an x11 error. I believe this to be a factory tune as the car has very minimal bolt on parts. I pulled the radio fuse as it does have an aftermarket radio....same error. I've reached out to both HPtuners and several others who seemingly have never has this issue (ZZP, Trifecta, BNR) I'm to the point that going to a standalone is going to save me a great deal of time. The current ecm is not bricked, as the car runs and drives well other than an O2 sensor stuck at 1278mv. I've contemplated disconnecting the BCM as I think this may be where my issue is. Any help or direction?