D-link Dsl-2750u C1 Firmware [new] Site
If your "C1" is running painfully slow, the best thing you can do is install . Because of the MediaTek chipset, support is surprisingly solid.
While technically a hardware issue, the firmware controls the power output. If your router reboots randomly, it may be overheating. Newer firmware versions sometimes adjust the Wi-Fi transmit power calibration to run slightly cooler, though the best solution is physical ventilation. d-link dsl-2750u c1 firmware