Both the BMP280 and SPL06 are pressure sensors. So I read that as you can have either the BMP280 or the SPL06, not both. Like a car, which can have a stereo from panasonic or sony.
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.
Could you also try the reset as in https://forum.espruino.com/conversations/381706/ IF you also have a SPL06.