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Picked my KW902 apart today to see what's inside. It features _probably_ a SN65HVDA1050A CAN tranciever (ISO 11898-2 high speed up tp 1 Mbps) a BK3231S SoC for Bluetooth 3.0 and 4.0 programmable via JTAG/FLASH both controlled by a PIC18F25K80 (cheapest of the family, also up to 1Mbps bit rate, comforms to CAN 2.0B) programmable via ICSP.

The pins for ICSP _may_ be exposed on the cable for the LED and RST button but since I don't have the equipment to read out the firmware I didn't look too closely and called it a day - for now. This cheap IC costs ~2 EUR btw and is well documented.

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