1. Confirm the exact router model
Use the label on the router and the current administration page to confirm the exact model. Similar product names can use different firmware images.
2. Back up configuration details
Save the existing router configuration and separately record WAN, Wi-Fi, DNS, VPN and any custom settings. A written record is useful when a backup cannot be restored across a major version change.
3. Upload the correct firmware
Use the router administration firmware-upgrade page and select the image intended for your exact device. Keep power stable and avoid wireless interruptions during the write.
4. Reboot, verify and decide whether to reset
After the router returns, test WAN access, Wi-Fi, DNS and any critical services. A clean reset can be appropriate after a major branch transition or persistent unexplained behavior.
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.