How to solve TCSCDP DS150 Unknown diagnostic id error

I bought a TCSCDP DS150 Bluetooth pro scan tool from EOBD2.fr in late November and received it last Thursday. The tool looks neat and works fine. But when I connected it to my 05 BMW X3 via Bluetooth, something seemed wrong. I got a message “Unknown diagnostic id. Generic protocol with standard information will be used”. I disassemble the CDP 150 and but had no idea where to start. Then I sent the seller an email and it provided me a solution that finally got the issue fixed.
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According to the seller, there are some gadgets I should check. The first are the marked parts on the PCB showed in the following picture.
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Second are the FTDI chips marked in below picture.
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Third is the 513A 0523 IC (integrated circuit) which works as a bridge to connect TCSCDP DS150 Bluetooth and BMW vehicles.
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Finally, the diode GEX28A marked in red circle.
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I checked all the parts and found out that the diode GEX28A was a little bit loose. I removed it and soldered it back. Then I tried the Bluetooth connection again. It would work! If your CDP DS150 has the same issue, like mine, a little soldering may fix it. If you do not know how to do the soldering, you had better get a professional.

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