I'd say the most likely explanation for your problem is an error with setup. I use the Celestron Skysync GPS with my AZ-EQ6/Starsense so there's no need to enter any data at start up.
I once owned a second hand starsense purchased from a guy who moved here from the UK - didn't matter that it had UK location entered, it still got the correct data from the GPS module.(you have to select GPS as the source for time/date).
I haven't updated my Starsense for Skywatcher so I don't know about flashing the camera.
If you purchase a new mount the shop may have a demo model you could try your starsense on prior to purchase - they might be able to help figure out if you've made any errors with the handset or if the unit is faulty.
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