If your internet is working fine, stick with official firmware. If your carrier forces poor bands or your router is carrier-locked, exploring unlocked firmware is worthwhile.
Use the app (Windows) or HManager (Android) to send hidden AT commands via the router’s API. No firmware flash required.
A: Yes, but only to versions older than your current one if the “rollback flag” is enabled. Use the local upgrade method with an older .bin . If you get a “version mismatch” error, downgrading is blocked.
You can update the firmware through the web interface or the official mobile app.