Finally, I got my watch updated :-)
I started the upload process via the nRF Toolbox over and over again (approx. 20 times) as mentioned by @ajkm and slowly progressed towards 100%.
The trick was to touch the watch (do not not reboot to enter DFUTarg mode with waiting for "==="). It is automatically in DFUTarg mode when the emergency screen is there.
Thanks for the support. Now I have to test al the new apps added in the meantime :-)
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