Open source firmware for the Matek 1.3 GHz +28 dBm Analog Video Transmitter
Use this link in the "Additional Boards Managers URLs" field: https://github.com/stm32duino/BoardManagerFiles/raw/master/STM32/package_stm_index.json
In the Arduino IDE set the following under the "Tools" menu:
* Board: "Electronic Speed Controllers"
* Board Part Number: "Wraith V1 ESC"
* Upload Method: "STM32CubeProgrammer (SWD)"