Hi,
I have a new H9i which came with the 5.0.4 firmware. It worked without any issues and setting everything up with the Bang & Olufsen app for Android worked well. The app's changelog mentioned the ability to disable the proximity sensor but I could not find it anywhere in the app. Out of curiosity I joined the beta program on Google Play and soon I got a new update for the app with the same(?) changelog.
After a while, the app notified me about a new software update it offered me the new 5.0.7 firmware which adds the ability to disable the proximity sensor. This was probably the reason why the app did not show the option for me, yet. I downloaded the firmware and the app successfully sent it over to the H9i. Then it notified me that the H9i needs to restart and that this could take 1-2 minutes.
After ~15 minutes it was still not done. The H9i was still connected to my phone and my PC, its ANC was active but no playback would work. The power switch was also not functional.
I waited a little longer and as a last resort I removed the battery and the H9i started to work again. It seems like whenever I use the B&O app to connect to the H9i, the H9i locks up and returns in the above mentioned state. Going back to the stable release channel for the app did not change this.
Is this a bug in the new 5.0.7 firmware or did I somehow botch the upgrade process? I can't check if the firmware is really at 5.0.7 or in an undefined intermediate stage in between.
For now I uninstalled the B&O app and the H9i works without any issues. I contacted the support from within the app but I have no response yet. :(