if you're still reading then you've probably had all the background info you can stand and are dying to get to some actual hacking. He's got instructions if you'd like to build the firmware from source, or if you'd like to program the adapter via Flash Magic. has built an open source OBD-II Adapter which provides a serial interface using the ELM327 command set and supports all OBD-II standards. Two firmware versions are available: Unmodified Bluetooth adapter: Baud rate 38400. Reduced power consumption due to use of sleep mode. Firmware updates are possible with Deep OBD for BMW and VAG. Contains a bootstrap loader that allows firmware update without opening the device. To my surprise the component selection and layout was very similar to what I would have hacked together. A few months ago (ok, almost a year) I decided to disassemble an ELM327 to see how the generic OBD reader works. Are you using the MX Bluetooth or WIFI? If WIFI, their forum seems. Please note that forum post is a few years old and may not have current information. I've never updated the firmware on one of these devices, but this forum post has some information.
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