Using the nRF tool to update isn't the most user friendly method, but the issues you experienced isn't normal and hopefully the issue should be fixed now that you've managed to update. Once Gordon gets the App loader firmware updater working it'll be a breeze...
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.
It normally isn't...
Using the nRF tool to update isn't the most user friendly method, but the issues you experienced isn't normal and hopefully the issue should be fixed now that you've managed to update. Once Gordon gets the App loader firmware updater working it'll be a breeze...