

Do you mean phones without unlocked bootloaders ? errrrmmmmmm you can’t
Check the LineageOS device suport list : if your device was ever supported, you cand build for yourself (provided you have enough horsepower), or request an unofficial build in the iodéOS forums
No, I am referring to iodéOS.
iodéOS official supported devices
I had asked here - feddit.uk/post/49734939
The models below are officially supported by the iodé team. Don’t see your device in the list? Don’t panic! We also support a iodéOS GSI. You can also find here a list of unofficially supported models by the iodé community. iodé is an open source community project, and relies heavily on your contributions!
The wording on that table can be confusing; “Bootloader locked?” Yes/No is referring to the ability of Iodé installer and ROM to have that device bootloader re-locked after installation.
I can garantee you pretty much all of them come with a locked bootloader from the factory/shop (even if they have a “no” on that page), and it needs to be unlocked to install a different rom from the stock one. Doesn’t matter what flavor of Android it is. It might be that IodéOS installer is doing it immediately after and so you’d think it wasn’t ever unlocked, but it was.