You tried accessing: /device/FP4
files are below:
https://lineage.grimler.se/builds/lineage-20.0-20231012-unofficial-FP4-signed.zip
https://lineage.grimler.se/builds/lineage-20.0-20231013-unofficial-FP4-signed.zip
https://lineage.grimler.se/builds/lineage-20.0-20240427-unofficial-FP4-signed.zip