Bluetooth / HF problem - Galaxy S II Q&A, Help & Troubleshooting

Good morning,
A one pleasure - if anybody know solution. I have a problem with SII and car BT set (s). Recognizing and pairing are O.K. Also dialing but - if is a number were dialed - I did not hear opposite side and from loudspeaker is hearing only an internal car cabin noise and appear acoustic feedback. BT is unusable. Generally - problem seems to income from SII. Not from HF. for what? I was try to on bout my cars wit different HF sets and for sure - on another two cars. Result - still the same...
HW/SW info:
SII
-Core revision:2.6.35.7-I9100XWKE2-CL187606
-Base band revision:I9100XXKDJ
-Operation System: Stock 2.3.2
HF
Nokia KC200 - uploaded lastest FW
Sony Car radio with BT - DSX-S200X (no FW upgradable)
Many Thx for any ideas...
(sorry for my english....

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Hello,
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