Did a factory reset, flashed the original images, flashed LOS recovery, the LOS installation instructions state to wipe data/factory reset before flashing LOS, which I did – but that's apparently a big error in the guide (https://wiki.lineageos.org/devices/pro1/install). That apparently removed the adb connection, so I couldn't flash LOS anymore. Tried to reboot, but now the phone doesn't boot anymore. Stuck at the logo forever. Also no possibility to ADB or fastboot connect 😕 How can I debrick?
Retried adb sideload and restart to recovery a dozend times and suddenly it worked.