I bought an st-link2 clone which arrived today.
I've connected ground to ground on the mini, reset to reset on the min, SWCLK to pin 21, and SWDIO to pin 22
I then powered the Mini only by USB (so not 3.3v connection from the st-link2 clone)
The st-link utility reports the following:
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11:23:49 : Can not connect to target! Please select "Connect Under Reset" mode from Target->Settings menu and try again. If you're trying to connect to a low frequency application , please select a lower SWD Frequency mode from Target->Settings menu. 11:23:50 : No target connected
I cannot find an option labelled 'Connect Under Reset' in the Target->Settings menu.
I don't want to try my other working mini in fear I might kill it.
This is the reference info I used for the pins: