@stanwood Can´t boot the device anymore. It always stucks with Redmi Logo. That´s bad. Need a coffee now ...

@stanwood Okay, that was a phantastic hint - thanks a lot!
Installation passed so far, UBportsInstaller downloaded some additional files (14) successfully. But now the device stucks with "Redmi" Logo since approx 10mins.
UBportsinstaller says "Waiting for device..." and "Adb is scanning for devices"

I will reboot manually now.

@stanwood Thanks, I will try that.

@stanwood may I jump in that topic here please. I downloaded the LineageOS zip from the webpage the installer opened for me. After download I wanted to continue the installation but it terminated with "error checksum different".
Seems I hava a wrong img?

Downloaded another LineageOS.zip from a "mirror", same problem.
I do NOT have to unzip this file first, do I?

What is wrong here?