Thanks for your feedback.
QuoteShould be possible with "standard" addon configuration. If not, it need to be fixed!
I x-checked again and can confirm that I got today a possibility to change the zeroconf port in the librespot configuration GUI:
I am quite sure that yesterday evening after upgrading to LibreELEC-RPi4.aarch64-13.0-nightly-20251128-85c6ad7 the last two lines were not shown. Yesterday evening the userdata settings.xml was still the old one from a very previous librespot version, see at the beginning of this thread.
/storage/.kodi/userdata/addon_data/service.librespot/settings.xml
Thanks again for your great support.