You don't say how you flashed the board but would recommend esptool - helpful when you want to completely wipe flash.
esptool.py erase_flash
@Ollie 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.
You don't say how you flashed the board but would recommend esptool - helpful when you want to completely wipe flash.
esptool.py erase_flash