April 23, 20213 yr Possibly some hard-reset. Electronic devises normally may have some not-so-easy-to-access button for a hard-reset/reboot operation. I guess, this button may switch-off the hub, or un-pair the Bluetooth connection. However, once you access the button by removal the battery compartment, you will disconnect it anyways))
April 24, 20213 yr My guess is a factory reset in case of failed firmware upgrade. This is usual on programable electronics in order to be able to restore if a update of firmware fails. it probably relays on power in the caps and has to be pressed for a certain time... But can't say for sure. _ED_
April 24, 20213 yr Well, with batteries removed (for some time) that "reset button" does not make that much sense - no power - no reset :))) Now has been speculated elsewhere and has been used as that by TLG: https://bricks.stackexchange.com/questions/15530/what-internal-electronics-does-the-control-technic-hub-88012-use I'd also go with "detect an alternative battery pack" Best Thorsten
April 25, 20213 yr This video (around 1:27) also speculates something like that, comparing this hub with the simple (non-Bluetooth) hub, in which that button seems to be missing:
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