Flashing steps for Lineage OS 18.1 Unofficial (29. 07.)

Clean flashing (strongly recommended)

1. Download and install OrangeFox recovery if you haven't already
2. Make sure to back up your data. I'd recommend using Swift Backup
3. Reboot to recovery
4. Wipe Dalvik, Cache and Data
5. Select ADB sideload in recovery
6. Navigate to the downloads folder on your PC and begin sideloading
7. Format data once the ROM has been flashed
8. Reboot to recovery again
9. Flash a GApps package (optional, strongly recommend), e. g. NikGapps Core
10. Flash Magisk (optional)
11. Reboot

Dirty flashing (only possible if you are on the previous build)

1. Reboot to OrangeFox
2. Select ADB sideload in recovery. Both Wipe Dalvik Cache and Wipe Cache options should be ticked.
3. Navigate to the downloads folder on your PC and begin sideloading
4. Most GApps packages and Magisk have a survival script. Check the logs to confirm if the restoration process was succesful. If it wasn't, reflash whatever failed.
5. Reboot

Note: if you don't have a PC you can also download the ROM to your phone, SD card, flash drive, or any other storage device. Skip steps 5-6 for clean flashing and steps 2-3 for dirty flashing. You have to select the zip file in the file explorer of OrangeFox instead of sideloading it. Don't forget to wipe Cache & Dalvik if you are dirty flashing.