Follow these manual steps to access the web-based gateway and flash your update file: How to Update Your Router's Firmware
Go to → Enable radio → Change channel (1,6,11 for 2.4GHz) → Save. If still missing, factory reset again. dlink dsl2750u h w ver j1 firmware updated
Ensure your router and computer are connected to a stable power source. Do not power off or unplug the device during the 2–3 minute update window. Follow these manual steps to access the web-based