Firmware Dlink Dsl2750u H W C1 New 'link'
The Ultimate Guide to New Firmware for the D-Link DSL-2750U (H/W Ver: C1)
Direct Resource Links:
D-Link maintains a dedicated resource folder for the DSL-2750U Hardware Revision C which often contains the most recent .bin firmware files.
If you choose to stick with the official firmware for security: How to update your D-link router (DSL 2750) - step by step firmware dlink dsl2750u h w c1 new