samsung – Having trouble unlocking boot loader galaxy s9

I’ve found numerous guides online on how to fix the missing OEM unlock toggle on samsung galaxy s9. I’ve been able to follow all steps except for the last one before rebooting the phone. And that step is going into software update and unchecking download updates automatically and checking download updates manually. The problem is that those options don’t exist! I can only tap on Check for updates and there’s a grayed out option that says Continue update. I don’t know if this is true but I think it’s the same as going into developer options and switching off auto update system, which I was able to do. Either way, I still wasn’t able to fix the missing button, even after following this guide I was just talking about. I’ve seen other guides and they talk about the same thing that this one does. Can someone help me unlock my OEM unlock button please? Some device info:

Model number: Samsung Galaxy S9 (SM-G960U)
Android Version: 10.0