Do you have anything connected to D0? That might be affecting the reset usually done by the dts/cts lines.
@Wilberforce started
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.
Do you have anything connected to D0? That might be affecting the reset usually done by the dts/cts lines.