Hello, i enabled oem unlock, did reboot, install twrp, boot it, installed "Disable_Dm-Verity" (not 6.0 or 6.1 which are too old but "03.04.2020" as suggested by some);
But then, when reboot, it's looping on the S9 logo! So i did reboot into twrp, wiped data & tried to install another rom : same...