Unlocking oneplus 7 pro bootloader in 2025

Edit: Added my 'Solution' at the bottom

Does anyone know how I can unlock oneplus 7 Pros bootloader. I want to switch to lineageOs but am failing at that step during the install

Edit from lineage os 22.1:

What ended up working was downgrading to android 11 using the afformentioned unbrick tool. The issues I had with installing the driver originated in an incomplete unpack of the driver file by the windows explorer. After that worked, I was able to downgrade to oos 11. That's where the next issue came up: I had to upgrade to 12 again to continue the lineage install process but the first update (from an the flashed oos 11 to the latest oos 11) git stuck at 80% with an unlocked bootloader. For me it worked to update 11 as far as possible, only then unlocking the bootloader and lastly updating to oos12. After that you can continue with the lineage install as officially documented. I tried some stuff with twrp as well (wanted to dualboot postmarket OS) but that didn't work either so I just gave up.