NUCLEO-WL55JC1 bricked after 2nd flash?

[AHutt]

I recently bought a NUCLEO-WL55JC1 to try. I ran a very simple Mbed OS6 program (with serial output and an LED flashing), I had previously been running on an F411, which ran fine. I then changed a single variable (ms for LED flashing), and when I attempted to redeploy the modified code, it won't run.

I have tried vanilla "blinky" code, and the "mbed-os-example-lorawan", but nothing runs. The STLINK flasher LED flickers green/red, as expected, to indicate a programme flash, but no activity thereafter. I have tried upgrading the firmware to V3.J9.M3, but still no luck. Debugging also will not connect and it "actively refused".

Any ideas why this might be happening?

Thanks in advance.

[Louis AUDOLY]

Hello,

You can try to connect the board to your computer and to connect it to STM32CubeProgrammer and to erase all the board memory thanks to the little eraser on the bottom left corner of the window.

Then try to program it again your board.

Let me know if it works

Hope it helps

Regards