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1 month agoNormally LineageOS replaces the version of Android previously installed on the phone.
I don’t know why the process asks for Android 11 as a starting point. There are a couple of valid reasons why you might need this, depending on the device.
Can you share a link to the process description?

Thanks.
As other people people already guessed this is needed because more recent versions of the Stock OS won’t let you install a Custom rom.
After you’re done the old stock OS will be replaced fully by lineageOS.