A bootloader for the STM32F105RC. Based on the usb_dfu for Lisa-M-1 in opencm3-examples. Needs libopencm3.
https://github.com/libopencm3/libopencm3-examples/tree/master/examples/stm32/f1/lisa-m-1/usb_dfu
For Windows WinUSB drivers from zadig are needed.