How did you manage to get that beta version? Asus's site and router ui shows only: 3.0.0.4.386_42643-g16dc577There's a beta release floating around out there for the GT-AC5300, 9.0.0.4.386_43576-g649d261. This firmware release fixed issues users were having running Pi-hole DNS servers on their LAN's. Otherwise no new official firmware for the GT-AC5300 since May 2021, which is disappointing considering it was one of ASUS's flagship routers. It's not as popular or as widely-used as other ASUS router models, so it's probably not high on the priority list for future firmware development.