Press and hold the buttons simultaneously.
SamPWND provides root access without actually unlocking the bootloader, using modified firmware. A full bootloader unlock gives you complete control, allowing you to flash custom recoveries and ROMs. SamPWND is more limited but also less invasive. unlock bootloader samsung s9 snapdragon high quality
After unlocking the bootloader and potentially installing a custom ROM: Press and hold the buttons simultaneously
The unlocking process completely wipes your device. Back up everything. and Secure Folder.
Flash the files. This installs a pre-rooted firmware featuring Safestrap.
Samsung's Knox security framework will likely trip permanently. This permanently disables Samsung Pay, Samsung Pass, and Secure Folder.