To upload the new file, you must log into the local web-based configuration utility.

D-Link DSL-124 Go to product viewer dialog for this item. Firmware Update Guide: Download and Installation Keeping your D-Link DSL-124 Wireless N300 ADSL2+ Router

Log into your router dashboard, navigate to the system management settings, and export your current configuration file. This allows you to restore your ISPs PPPoE credentials and Wi-Fi passwords if the update forces a factory reset.