Warning: Before following these instructions please ensure that the device is currently using
Android 6.0.1 firmware.
If the vendor provided multiple updates for that version, e.g. security updates, make sure you are on the latest!
If your current installation is newer or older than Android 6.0.1, please upgrade or downgrade to the required version before proceeding
(guides can be found on the internet!).

This requirement is already met when you are upgrading from LineageOS 18.1 or newer!

Warning: Before following these instructions please ensure that the device is currently using
Android 6.0.1 firmware.
If the vendor provided multiple updates for that version, e.g. security updates, make sure you are on the latest!
If your current installation is newer or older than Android 6.0.1, please upgrade or downgrade to the required version before proceeding
(guides can be found on the internet!).

This requirement is already met when you are upgrading from LineageOS 18.1 or newer!