Based on community feedback and D-Link’s release notes, here are the most stable firmware versions for the DSL-124:
The "BEST" download source is always the official D-Link Support website, as third-party sites may host corrupted or infected files. D-link Dsl-124 Firmware Update Download --BEST
Search this exact string on Google (replace A1 with your version): "DSL-124_A1" firmware download site:ftp.dlinklink.com Based on community feedback and D-Link’s release notes,