Trying to reflash Fairphone 4 with Fairphone OS 11, but scripts pause

Help Fairphone 4
21

Here is some relevant information on fastboot commands and fastbootd:
https://source.android.com/docs/core/architecture/bootloader/fastbootd

22

whatever it is used for, it is the wrong mode when you want to flash an OS. Just use the bootloader mode which you can enter by adb reboot bootloader or as you said