Exact model matching
A router family may contain several devices with different hardware, flash layouts and drivers. Always match the firmware image to the exact supported model.
Main project versus compatible forks
The main project supports a defined hardware set. Gnuton Asus Merlin is a separate community-maintained option for some additional devices, and its support list should be treated independently.
Hardware limitations remain
Firmware cannot remove CPU, memory or radio limitations. VPN throughput, QoS capacity and advanced filtering performance remain tied to the router hardware.
Plan for recovery
Knowing the router recovery or rescue process before upgrading reduces risk. Keep a wired connection available and avoid changing firmware when the network must remain uninterrupted.
Practical takeaway
Keep changes model-specific, document your current settings, and test one change at a time. That approach makes future upgrades and troubleshooting much easier.