Thank you for the answer.
I have already tried all of the above, but that did not help. But nevertheless I fixed this problem.
A few smashes on the table helped.

Hello!
I just received my BV8000 pro.
I have the problem - the "ear" speaker does not work.
When making or receiving a call I can’t hear any sound.
Speakerphone and headphone are working fine.
How to solve this problem?