STM32MP1 Linux Image Programming Tool
This tool automates programming of the STM32MP1 Linux FLASH images produced by the OpenSTLinux build process. Simply select a .tsv file specifying the FLASH layout of your board and the tool will automatically launch the STM32CubeProgrammer with the correct parameters to program it:
Download
You can download the tool here STM32MP1Programmer-1.1-sfx.exe.
More details
See this page for detailed instructions on enabling the bootloader on STM32 boards.