Before attempting an upgrade, it is vital to ensure you have the correct file for your specific hardware version (e.g., Hardware Version I1). Using incorrect firmware can permanently damage your router.
Since official support has ceased, locating the final firmware release requires careful searching through D-Link's regional support websites. The following table outlines the primary sources for DSL-124 resources:
Updates often include fixes for the 2.4GHz wireless band, minimizing random disconnects and improving signal penetration.
Note down the letter and number combination (e.g., H1 or T1 ). You will need this to download the correct file. Step 2: Download the Newest Official Firmware File
Use a paperclip to press and hold the "Reset" button on the back of the router for 10 seconds while it is powered on. Note that this will erase your configuration (ISP credentials, Wi-Fi password).