Before you begin, ensure you have a stable power connection. Do not attempt this during a storm or if you are on a laptop with low battery.
Where to get firmware
D-Link routers often come in multiple hardware revisions (e.g., C1, U1, V1, J1), each requiring specific firmware files. Using firmware meant for a different hardware version can lead to permanent device failure (bricking) or void the warranty. For the H/W Ver. J1 d-link dsl-2750u h w ver j1 firmware
Rare, but possible. Clone routers often misreport hardware. In this case, try opening the casing (dangerous – risk of shock). Look for the mainboard marking printed on the PCB. It should say DSL-2750U J1 Rev A or similar. Before you begin, ensure you have a stable power connection
