Compile the TT firmware
Try
Give marlin folder admin rights
in platformio.ini
change env_default = LPC1768 to default_envs = LPC1768 (new version command in platformio)
uncomment extra_scripts = Marlin/src/HAL/HAL_LPC1768/upload_extra_script.py or remove line (calling python script for saving location)
upload_port = /dev/ttyUSB0 change to upload_port = D: (or some drive visible to system)