i followed the same procedure. At step 11 i gave start in Odin in windows PC, then i hold down Volume Up, Bixby, and Power buttons together for about 5 seconds i didn’t get the screen like in step 12. i got some red color messages by mentioning failed to mount and failed to …etc. Then immediately it asked to reset phone.
Is the problem with TWRP ?
My Model number is SM-G965F