The Elite Nero I own since August 2019. I use the Nero within Zwift on PC since October 2019. All worked properly.
On December I made a firmware update of the Nero with the Android app Upgrado. From this point in time the Nero does not work properly anymore: the measured power changes verry/too slowly an the ergo mode loop back control within the Nero also does not work.
==> DO NOT UPGRADE the the firmware of the Elite Nero!