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Is there some way I can test the Bluetooth on the watch?
you may try nrfConnect https://play.google.com/store/apps/details?id=no.nordicsemi.android.mcp&hl=en&gl=US and check if you see it in the scan
you can also follow the guide linked above but at the step
"Keep pressing the button while ==== goes across the screen"
you can release button when in the middle.
This should stay in firmware update mode for a minute or so. Again check in nrfConnect, you may see it as DFUtarg device. This may work even if there is something wrong with Espruino firmware.
Got to the screen with the logo and MAC address, tried to connect again (from the apps page), no luck.
It could be a case of PEBKAC, here's what I'm doing:
Is there some way I can test the Bluetooth on the watch?