Do not trust third-party “firmware download” sites. Always verify the hardware version. If your device is still on firmware older than 2019, you are at significant security risk. Update today—carefully.
For basic ADSL connections (up to 24 Mbps download), the latest official v2.12 is stable and safe. For fiber connections or security-sensitive environments, retire this router. Latest Firmware For D-link Dsl-2750u H W V2
Before downloading any firmware, verify your revision. The label on the bottom of the unit will state (or C2/C3 – note that V2 often overlaps with C2/C3 board IDs). Alternatively, check the web interface at http://192.168.1.1 under Status > Device Info . Do not trust third-party “firmware download” sites
Version: IN_V2.05.14 (or IN_V2.05.16, depending on region) Release Date: June 2021 (last confirmed stable build) Update today—carefully
Always check the sticker on the bottom of your router to confirm the "H/W Ver." is exactly V2 or V2A/C1A . Pre-Update Checklist (Important)