Firmware D-link Dsl-2750u H W C1
Remember: when in doubt, do not flash. A working older firmware is infinitely better than a bricked one.
To ensure system stability and eliminate old configuration conflicts, perform a factory reset after a major firmware jump. firmware d-link dsl-2750u h w c1
Ensure the router and computer are plugged into a stable power source. A power loss during the rewrite process will corrupt the bootloader. Remember: when in doubt, do not flash