ST-Link
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There's a number of different ways to flash STM32 devices. One of these is to use ST's own ST-Link devices.
There are multiple benefits of using one of these ST-Link devices rather than a plain serial dongle:
- The device need not be restarted in flash mode (Boot0)
- Programs can be debugged on the device
The official ST-Link as seen above are relatively cheap (< $20) and there are Chinese copies available (haven't tried those).
The most common option are these:
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They are Chinese knock offs and they run the official ST-Link firmware.