My first BV 9900pro went into non recoverable bootloop after one week. I suspected a lemon and returned it. My new unit runs now two weeks and I have now some overview of pro and cons. It operates on Android 10 platform and it updated to the latest release.
GPS and FLIR work superb and I am happy with those.
FM radio is not stereo and works only with the supplied earbuds. Headphone with 3.5 mm adaptor on enabled OTG is not recognised by the radio app.
There is no autostart manager and no Third party app can autostart after boot. Each and ever app and widget need to be restarted manually. Alarms, network traffic indicator and notifications can therefore not work reliable. Contacts customisation gets lost after reboot. Hotspot tethering works on 5 Ghz but not on 2.4 GHz.
I expected a super reliable flagship phone and I am quite disappointed. I have contacted the service department and wait for clarification.

I have investigated the issues that I address for two weeks and have not posted this lightly. Please show some respect and do not offend me with quick responses that divert and do not address the issues.
Let me repeat:
FM radio does not work via OTG. Enabling OTG allows other audio but not FM radio. FM radio works with the supplied earbuds but is monaural - not stereophonic.
Autostart manager does not exist. If the phone restarts itself for any reason or is manually restarted all apps are stopped and no Third party app can start by itself after reboot. I have missed work because my music alarm app that I use since many years to wake in the morning cannot autostart on this phone. My business calendar notification widget cannot be loaded after restart and require manual restoration.
I have now looked at several forums and found many complaints about this - covering several blackview models.
It is the 2.4 GHz function of my phone in hotspot mode that does not work - has nothing to do with a router.
I forgot to mention that the macro lens is a useless gimmick. It gives far worse results in regard to colour and resolution than a post shooting digital zooming of the main camera.
The barometer cannot be calibrated making its altitude reading useless.
The phone as such is nice - but I begin to feel resentment to its botched operating system.