I just want to check whether bootloader is locked or unlocked. I am using Minimal ADB and Fastboot which I downloaded from here. I am following instructions to check bootloader from this website. Everything is fine until I enter into Fastboot mode on my phone. (I enabled USB Debugging and revoked usb debugging authorization in Developer Options). I can see my device after running adb devices in cmd. But when I run adb reboot bootloader command, it just reboots in normal mode. It doesn't enter to fastboot mode. I aslo tried adb reboot fastboot but it also didn't work. That means when I type fastboot devices, I don't see anything.
What should I do to enter Fastboot mode so that I can run fastboot oem device-info to see my bootloader information?
Note: My phone is Oppo F11 and it is running Android 11. I am not familiar with adb commands.