There is no way without SWD debugger (or I don't know about it). SWD debugger is < US$2 thing on aliexpress or you can use Raspberry Pico too. However easier is to check that post I linked above.
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.
See this https://forum.espruino.com/conversations/392898/#17246018
There is no way without SWD debugger (or I don't know about it). SWD debugger is < US$2 thing on aliexpress or you can use Raspberry Pico too. However easier is to check that post I linked above.