the build you once made that would install apps on the internal storage
I did one recently for someone else - try this! This one uses only internal flash, not external too (as there were issues there as @Ganblejs has pointed out).
Despite its name it seems that might be a Bangle.js 1 build. The app loader switches to Bangle.js 1 mode and i get a "Hold BTN3 to reload" (or similar) message after installing apps.
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.
I did one recently for someone else - try this! This one uses only internal flash, not external too (as there were issues there as @Ganblejs has pointed out).