After updating my Arcam SA35 to firmware 1.12.9, the Radia app can connect to the unit and only power on/off works.
The control page turns completely black, no volume slider, input selection or other controls available.
I have tried rebooting the amplifier, reinstalling the Radia app, and connecting the phone to 2.4GHz Wi‑Fi, the issue remains.
Many other users have reported the same problem.
Please look into this compatibility bug between 1.12.9 firmware and the latest Radia App.
Thank you.