Can't install TWRP on Mi Mix 2s

Oct 12, 2017
I've tried to flash 3 types of twrp included the one posted here, and none of them is working, one of them just kinda worked and booted, but after rebooting, mi-recovery is still there, and things I try to flash like SuperSU for example just don't show even when it shows it flashed correctly, some advices?

P.d.: the one that worked is only accessible from adb console, like C:\adb fastboot boot twrp.img