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Thanks.
Ah... too bad, then.... I'd love it if someone could add that info to the WebIDE which offers 'usb to serial' connection, and to the STM32 section at https://www.espruino.com/Firmware+Update which doesn't say anything about what kind of physical connection is required to perform the instructions.
My last backup is from May 10... :-( Should have made one this week.
try holding the button much longer to let it reboot and still hold it until you get to logo screen, then release, maybe then it will be available over bluetooth, or it should show factory reset options
usb does not provide serial tty and won't help much in this situation (it provides SWD port which is something else)