You downloaded the wrong hardware revision. Re-download the firmware for your specific version (A1, B1, or C1).
Because D-Link has removed many older files from their global sites, use this priority list: D-link Dsl-124 Firmware Update Download --BEST
reached its on March 31, 2024 . D-Link no longer develops new firmware for this model, and several unpatched security vulnerabilities exist, such as unauthenticated configuration disclosure . It is strongly recommended to replace this device with a supported model for better security . How to Find and Download Firmware You downloaded the wrong hardware revision