Unable to upgrade LSN50 v2 using ST-Link, got : " Error: No STM32 target found! "

[Jean Bonnot]

Hi all,

I've been trying for hours to upgrade the firmware on an LSN50 v2 using an ST-Link V3 adapter (V2 compatible) from ST + STM32CubeProgrammer and I always get the following error: Error: No STM32 target found!

I checked the wiring several times, I positioned the switch SW1 on ISP (no LED flashes at boot), I used all possible reset modes on STM32CubeProgrammer, all possible speeds,

I also used UART mode because nothing is clear in the upgrade manual !

and nothing worked.

Questions :
- Is it possible to upgrade using the SWD port?
If yes :
- What are the parameters?
Otherwise:
- Should we use ST-Link wiring but choose UART mode in STM32CubeProgrammer?

The tutorial on the upgrade via ST-Link should be a little clearer I think, especially with regard to the parameters and connection mode.