If you have a windows computer, a way to downgrade. Here is the file and procedure.
Mconnect is important for conneting with your Bridge
Link to the updater: http://updates.psaudio.com/BridgeII/
Unzip to a temp directory Run mConnectSetup.exe In the device list click on your bridge Click update Click choose file Click on psaudio_0ug_mqrstv_v3.5.1_20180109.img Click open Click update Wait 10 minutes Click on refresh When you bridge show up you can reboot.