Hello @ferranmc,
I apologize for the delay on this topic.
Thanks for the additional information about this issue.
We did some investigation into the problem in the linked post.
We were initially unable to use the HFP profile with pulseaudio.
Therefore we did not reproduce the exact problem that you have.
That being said, one of our domain experts is looking into the echo problem and is working to reproduce the problem, so updates are expected soon.
Best Regards,
Bruno