The STM32F103C8T6 'Blue Pill' may be programmed with an ST-LINK V2 dongle using the st-flash utility, available from
The binary is available from
Command line (on a Linux system):
$ st-flash write filename.bin 0x8000000
Advantage:
The stlink utilities are much easier to install than the STM32 tool chain.
Disadvantage:
It is a binary blob, so the source code cannot be edited with your callsign.
However, there is a feature in Config > Callsign which allows you to enter your callsign with your key. Once that is done, your callsign will appear on the Splash Screen, and will be used in Receive > QSO.