I guess I can answer this question myself: simply retry updating - after a while it will (hopefully) proceed.
Nevertheless, these problems are quite annoying...
Nota bene: it may be helpful to reload the App Loader page (at https://banglejs.com/apps/) in order to reset its internal BLE state - I found that the Bangle sometimes leaves the browser in a state that does not allow to reconnect the watch...
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 guess I can answer this question myself: simply retry updating - after a while it will (hopefully) proceed.
Nevertheless, these problems are quite annoying...
Nota bene: it may be helpful to reload the App Loader page (at https://banglejs.com/apps/) in order to reset its internal BLE state - I found that the Bangle sometimes leaves the browser in a state that does not allow to reconnect the watch...