This is the most commonly missed step. The DSL-124 has at least two hardware revisions: and B1 (possibly C1 in some markets). Firmware is not interchangeable between revisions.
A critical factor in the "new firmware" discourse is the device’s lifecycle status. As of recent analyses, the DSL-124 is categorized as End-of-Life (EOL) or End-of-Support (EOS) in many regions. dlink dsl124 firmware download new
