If you are flashing board with baseflight already flashed (updating), leave this checkbox unchecked.
If you are flashing "bare" board with no firmware preloaded or you have bootloader pins shorted, check this box.
Please do not try to flash non-baseflight hardware with this firmware flasher (it wont work).
Do not disconnect the board or turn off your computer while flashing.
Note: STM32 bootloader is stored in ROM, it cannot be bricked.
Note: Auto-Connect is always disabled while you are inside firmware flasher.