To access the bootloader you can perform these steps. They vary based on if you have a "Rev 02" board or a "Rev 03 or Later" board. The revision number is printed on the bottom side as part of the PCB part number (STM32F-03 is Rev -03 for example).
=== Rev -03 or Later ===
Run the following python code once you have the scope and target set up:
* If using a CW308 based STM, try mounting a jumper between the "SH-" and "SH+" pins at J16 (to the left of the SMA connector) on the UFO board. Retry programming with the jumper mounted.
=== Rev -02 Boards ===
The Rev -02 boards did not have all programming connections present. They require some additional steps: