You are reading a single comment by @Gordon and its replies.
Click here to read the full conversation.
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.
@Gordon
Yes, DFU is only for development - there's a solder jumper on the back of the Pico that you can short out in order to use it though.
The Pico's going to use basically the same bootloader as is on the original Espruino Board. It enumerates as a USB COM port that accepts ST's USART bootloader protocol, so you can flash it from the Web IDE.