Hi black view Is the android 10 update for my phone ok to be download? Asking as the coverage switches to the 3g from 4g too much and I would like to take advantage of the VoLTE capability on the 4g to have better calls. Location is New Zealand I'm on build number BV9900Pro_EEA_S900AA_V1.0_20200601V09

The issue I was having wasn't resolved after a tech person looked at the phone, so I have since sent it back to where it was purchased from and got a replacement, the new unit doesn't have the issue and all functions as normal, so was a faulty unit not a setting.

No echo when on hands free, and once the in call volume is turned to 0 then the other person cant hear the echo

Build number:

BV9900Pro_EEA_S900AA_V1.0_20200601V09

no this does not happen during hands free. only during normal calls, if I turn the call volume to 0 only then does the issue go away for the other person. Im wondering why I can still hear them if its set to 0, is this a faulty speaker? I have tested this by calling 2 other phones they are on differ...

When im speaking to someone they can hear themselves echo bad rather badly, I cannot hear this from the headset.
Is there a easy fix as in software ? or is this more likely to be a hardware issue. 
Ive only had the phone for a week.