[Q] Change bluetooth stack on 12.1.A.1.201 - Xperia SP Q&A, Help & Troubleshooting

Hello,
My SP cannot connect to my Opel NAVI SD900 (gps + bluetooth handsfree) since the upgrade to JB 4.3 (266 or 201), everything was working fine with firmware 12.0.A.2.254.
There is no update by Opel for their Navi system and I don't want to return to 12.0.A.2.254, because the bugs on the WIFI.
I'm now running the firmware from Dipesh1502 (http://forum.xda-developers.com/showthread.php?t=2704312) and my question is:
There is a way to have the bluetooth stack from the JB 4.1.2 running on a JB 4.3?
Thanks in advance,
Marty

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coochchilli said:
I have a rooted z3c on android 6.0.1 , is it possible to downgrade my mirrorlink version to Mirrorlink 1.1 (used in Kitkat 4.4.4) from the version installed with 6.0.1?
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Click to expand...
Click to collapse
Wich version of mirrorlink do You Have on z3c 6.0.1? I've z3 5.1.1 and mirrorlink 1.0, I've not upgraded firmware anymore to avoid mirrorlink upgrade...

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(Sorry for my bad English).
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Goyangkekanan said:
You can change rom device into japan version, it has good connection
Click to expand...
Click to collapse
What is the Android version of that Rom? I hope that's not 4.4

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