Update

Because I root my phone, I have to follow some specific steps to update my system correctly.

Requires a PC

Devices

Acquire LineageOS Update Zip-file

The newest update can either be downloaded through the built-in updater, exported to local storage and copied to the PC, or downloaded directly from download.lineageos.org

Patch Boot image with Magisk

1. Download latest Boot image
2. Patch with Magisk
3. Copy to PC

Update LineageOS

1. Enable USB Debugging through ADB
2. Run adb reboot sideload
3. Update using adb sideload LINEAGE_UPDATE.zip

Reinstall Magisk

An alternative is installing Lygisk, which allows for automatic reinstallation after OTA Upgrades

1. Boot to fastboot: adb reboot bootloader
2. Run fastboot flash boot MAGISK_PATCHED.img
3. Reboot to system fastboot reboot

And the update's done!

Links

Update LineageOS on pyxis
Magisk Installation > Patching Images