*.You must have enabled OEM unlock in developer options
1.Turn off phone and go to recovery menu (hold Volume+, Bixby key and Power)
2.Wipe data and cache partitions
3.Use Power off option
4.Go to download mode (for S9/S9+ hold Volume-, Bixby key and Power, for N9 only hold Volume- and Bixby key then connect cable), you CAN'T let ROM start booting
5.Flash latest TWRP via latest Odin & latest drivers, put TWRP.tar into AP then press Start and hold your phone in hand while flashing
6.When phone auto rebooting fastly press and hold Volume+, Bixby key and Power exactly while Galaxy logo pop-up to get into TWRP recovery, you CAN'T let ROM start booting
7.Go to TWRP>Advanced wipe, select ALL PARTITIONS and swipe to wipe, then use reboot to recovery option
1.Copy ROM.zip and Firmware.zip to phone (via MTP mode or just into your SD-Card) and just flash ROM and then Firmware via TWRP>Install zip
2.After first boot, open Ultimate Control app to let him get ROOT access and go to Magisk Manager > Modules and install them from _MagiskModules folder on your internal memory (only if you are ROOT'ed)
1.Copy ROM.zip to phone (via MTP mode or just into your SD-Card) and just flash it via TWRP>Install zip
2.Flash it as always just with select "Dirty flash (update)" option in Aroma instead of "Full wipe (clean install)"
3.You can update also firmware (bootloader and modem) and kernel if new ones are out, just flash Firmware.zip or Kernel.zip same as any other one
*.Don't forget to flash latest Magisk.zip after update kernel if you were ROOT'ed!