If the page won't load, try resetting the router. Use a paperclip to hold the Reset button on the back for 10 seconds. This will revert the IP and login credentials to factory defaults.
Helps newer smartphones and laptops maintain a steady connection to the older hardware. Pre-Update Checklist Huawei Echolife Hg521 Firmware Update
Before you begin, follow these steps to prevent "bricking" your router (rendering it unusable): If the page won't load, try resetting the router
