i have 2 original interfaces among others and i had problems with them( they are the old ones with the usb b male connexion)
the one had a problem with the usb port( the cable could not attach in the port) and i had a message that the device could not be recognized.
and the other had 2 wires cut in the cable between obd plug and the round 30 pin plug.
check those and if you have cut wires i can make a diagram if you like, cause all cables are white
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