I wasn’t smart enough for these instructions for the point “Flashing additional partitions”. My problem was that I didn’t know that I had to unpack the file payload.bin with payload-dumper-go to get the two files dtbo.img + vendor_boot.img. I thought that if these files were not there, I would have to get the two files from LineageOS. But when I tried that, the adb sideload did not work. The detailed problem and the final solution can be read here:G32 adb sideload no devices/emulators - #7 by sqNci