[compat] <Model> <Year> <HW> <Firmware> — <region>

[1291793864-maker]

Tesla model

Model S (2016-2020)

Year

2016

HW version

HW3

Tesla firmware version

2025.38.6

Region / market

China

App mode used

Legacy

Force FSD setting

ON (region without the Traffic Light toggle)

Result

Worked — FSD activated and remained stable

Anything else

MCU1 works good!

[marcobellinoroci-source]

Explain how you did it

[deftdawg]

Cool, I've never seen a Chinese MCU1 car! You should snapshot this git repo, should you ever need to access its software internals

[hypery11]

@marcobellinoroci-source Standard flow for MCU1 cars: in app Settings, set Mode → Legacy (MCU1 does not run modern HW3-style 0x3FD frames), and Force FSD → ON if your firmware does not show a TLSSC toggle. @1291793864-maker was on 2025.38.6 which is well-supported. Quick start is in the README.

@1291793864-maker — could you share what hardware you used (Flipper/ESP32 + which CAN transceiver) and where you tapped the bus? MCU1 documentation in HARDWARE.md is sparse, your details would help the next MCU1 tester.