Default [Q] Bluetooth microphone input not working on android 4.1.1

Hi,

really wondering if this forum will help to solve my problem???
I have a rooted android 4.1.1 with CWM on it. It is a phone from Thailand. No ROMS available with a higher android version.

Issue: I have a BTR-155 Bluetooth speaker microphone. Bluetooth connection works fine, but microphone input does not work.
I have been trying to understand the issue. I think it has something to do with A2DP and AVRCP.
The issue seems to be fixed with the newer androids.
Can I just copy the fix by copying the fixed files on top of the OS?
How can I do that?

Really wondering if someone here will give me a hint.

Merry Christmas everybody.