To flash Tomu use:
dfu-util -d 1209:70b1 -D u2f-TOMU.bin
To flash STM32 use:
openocd -f interface/stlink-v2.cfg -f target/stm32f1x.cfg -c 'init' -c 'halt' -c 'flash write_image erase unlock u2f-BLUE_PILL.bin 0x08000000' -c 'exit'
Release binaries come with readout protection enabled. You will need to initialize your device after flashing (tested with python3):
pip install -r requirements.txt --user
cd src/cert
./gen.sh
./certtool init