Chime stuck on firmware update

Hi all, Obtained Ring Video Doorbell Pro as a second hand product. Doorbell working fine, incl. setup and network connection. But chime have problems: installation seems to go fine, but stucks into firmware update. Tried so far: - reset button 5 secs / 60 secs - this enables discovery - switch off for multiple hours - let it update for 10 hours - remove device - add device on app Latest trials goes as following: - selecting: devices, chime, device health (showing firmware up-to-date), reconnect to wifi - 5 second reset -\> light pulses very fast -\> fast -\> slow - tap to connect chime -\> selected the only chime I own - not using previous wifi -\> selecting wifi and entering (copy-pasting) pw - obtaining success message (after phone reconnected to real network); chime light has started pulsing fast instead of slow - obtaining eternal "updating firmware" message - according to the router, the Chime is connected and obtained IP (ending .156), and it communicates quite constantly aprx 2...9 kbps downlink I'm quite exhausted on this: is there some error on chime, or shall I wait more to get fw updated? Am I missing something on this, shall I do something differently? - Pekka