Thanks for your help.
After 2 days hard work /e/ Android 10 is running!!!
I have to admit that the big problems are not caused by /e/ software directly but by 3 reasons:
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Tried to flash with Linux. Currently there seems to be a bug within adb/fastboot. Use Windows until further notice. Hope it will run in future under Linux.
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Did not use the latest platform-tools. Even under Win Minimal ADB and Fastboot is very old and not suitable. Always download latest platform-tools (do not use Minimal ADB and Fastboot) as adviced by Ingo and AnotherElk.
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I made a very severe mistake and continued installation after receiving the info:
" fastboot -w
wiping userdata…
CreateProcess failed: Das System kann die angegebene Datei nicht finden. (2)
error: Cannot generate image for userdata"
All further commands work (that is the problem!!!) and also lock bootloader but then the system does not start.
This resulted in a completely unusable phone with locked bootloader and I had the impression that it is bricked. With your help I unlocked bootloader again.
After 2 days “try and error” I found a solution by chance:
a) installed the new
lineage-16.0-20201116-recovery-FP3.img
This is a very effective and lightweight recovery. With this recovery is was possible to delete and format.
Then back to /e/ it was no problem under win 10 with latest platform-tools to execute commands :
fastboot -w and all other commands.
Hint: You should always copy and paste commands to avoid any typing errors.
I now belong to the happiest people of the world as my FP3 is working again 