I spent a long time trying to unlock the bootloader on the global version of the One Plus 15 (CPH2474) (Oxygen OS). I watched several videos and realized that with the new 16.0.3.503 update, the developers themselves disabled the ability to enter fastboot, burning the fastboot module itself. In my case, everything is as I said, but I don't know about the Chinese version or others. Please share your solutions and opinions.