: Enable "Auto-check New Version" or manually click the Check button.
: In the router interface, navigate to the Maintenance or Management section and select Firmware Update .
Most ISPs push updates automatically.
If your router has uptime > 90 days, power cycle it, then perform a factory reset (via pinhole button for 10 seconds). This clears temporary glitches that can interrupt flashing.
: Confirm you have the V2.2 hardware version. Installing firmware meant for V1.x or V3.x can cause hardware failure. How to Update ZXHN H168N V2.2 Firmware Method 1: Automatic Online Update