Disclaimer: This is a general guide. Always follow the specific XDA thread for your ROM. Proceed at your own risk.
The ROG Phone 6 is Project Treble compatible. You can flash GSI (like Evolution X or Pixel Experience). asus rog phone 6 custom rom
While the "golden age" of flashing new ROMs every weekend has slowed as manufacturers prioritize security, the ROG Phone 6 Disclaimer: This is a general guide
Method assumes a modern ROM using (not old TWRP). asus rog phone 6 custom rom