Samsung Galaxy Note 9 root

Hi,

been following the video How to Root Galaxy Note 9! [EASIEST METHOD] - YouTube
first attempt, looked like everything went well but it did not install magisk and phone was not rooted, 2nd attempted, i saw that in 8:02 part of the video, you can see in the video its flashing and installed, but for me after the “-Checking ramdisk status”
it shows " !Boot image patched by unsupported programs" and “! Please restore stock boot image”.

how do i continue?