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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@user91236
Ok Ill check my code again. In Keil I did change the target to Pico chip but it is essential the same chip as my nucleo 401RE.
Yes I can reload Espruino back on it and it works and can program through web IDE even. That's how I know the DFU process is working.
Guess I wasn't sure if this process got rid of the Espruino bootloader too and that was causing problems if left behind.