Hello everyone, I am a beginner. My ASUS router RT-AC86U was purchased in 2020. It is an older model. The current firmware version is: 3.0.0.4.384.14_0. Recently, I plan to upgrade merlin to cope with different network needs. Therefore, I would like to ask everyone, what type of firmware version does my router support, and how can I find the right firmware? Thank you very much for helping me!