Clear your web browser's cache and cookies, or try using an Incognito/Private window. If that fails, open your computer's command prompt, type ipconfig , and check the "Default Gateway" address to see if the router's IP address changed. Network Speeds Dropped After the Update
While most updates preserve your Wi-Fi name (SSID), password, and custom configurations, write down important settings (like custom APNs or port forwarding rules) just in case the router resets to factory defaults.