Optimus Pro Firmware Upgrade

can someone please explain to me sometime how you connect the clock with a firmware update with the PC, how you installed the drivers.
No matter what I do I only get an error message.
I set the clock in the long economy mode start the flash program and put the clock on the charging station, then comes immediately an error message.
In normal mode, my clock connects to the PC perfectly, just not with the Flash program.
What are you doing differently?
Could you please describe it?

Many thanks

putting the watch in long standby isn’t enough, you have to turn it off

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