Hello there,
I'm a blind user and rely on Talkback to use my BV6800.
Talkback has a bunch of functions that can only be accessed using gestures on the fingerprint sensor. 
They do not work, and I am either suspecting this to be an issue with Android 8.0 Oreo,, or a block by BlackView on the OS.

1. If it's Android, how can I update to 8.1 or 9?
2. If its BlackView, how can I remove that limitation?

Gestures require me to swipe in different directions on the fingerprint sensor. 

Best,
Emrah

Guys, can anybody else confirm such issue? 

Hello!
There are a few apps on the App Store that allow you to use Fingerprint Gestures that you can use to verify my issue.
Example: https://play.google.com/store/apps/details?id=com.catalyst06.fingerprintactionpro&rdid=com.catalyst06.fingerprintactionpro

I believe the Fingerprint API has been disabled on the Firmware. Can you look into enabling it for the next update?

Unfortunately i need some more users to confirm such issue.