git clone https://git.code.sf.net/p/stm32flash/code stm32flash-code
cd stm32flash-code/
make
sudo make install

sudo apt install gcc-arm-none-eabi
git clone --recurse-submodules https://github.com/g4klx/MMDVM.git
cd MMDVM
vi Config.h

The default Config.h for MMDVM_RPT_Hat is as follows:

#if !defined(CONFIG_H) #define CONFIG_H #define EXTERNAL_OSC 12000000 #define MODE_LEDS #if defined(STM32F1) #define STM32F1_POG #else #define ARDUINO_DUE_ZUM_V10 #endif #define STM32F4_NUCLEO_MORPHO_HEADER #define MODE_PINS #define SEND_RSSI_DATA #define SERIAL_REPEATER #define USE_DCBLOCKER #endif