Here you go: instructions how my collegue got the NICLA VISION board working, after I bricked it:
First I soldered a 2.54mm pitch header to pins P3 to P6(you can also use wires or an edge connector). Then I connected these Pins to the corresponding pins from a ST-link(I used the ST-link from a nucleo board, with the CN2 connectors disconnected). Then install STM32Cubeprogrammer, and use it to download the following file: (https://github.com/arduino/ArduinoCore-mbed/raw/master/bootloaders/NICLA_VISION/bootloader.bin).
To upload the file to the Nicla vision board, provide power to it(I used the USB connector). When it’s powered the red led was continuously on (because it was bricked).
Now connect the ST-link to your computer and start the stm32Cubeprogrammer software and click on connect. It should be connecting to the stmH7 on the nicla vision. When connected, click on the + icon and select openfile. Then select the ‘bootloader.bin’ file and download it to the nicla vision with the download button to the right. When the download is completed the red light should go off and the nicla vision board should work again.
Br
Carl.