The
D-Link 2750u is actually capable of being used as a ethernet
router also, though this feature is not available in the Indian firmware. The feature can be seen on the Indian dlink product page under specs in router features (LAN/WAN switchable port) but despite many mails to them they have not enabled this.
Anyway, this feature is available on the ME firmware. Also many 3g dongles can be used after applying the ME firmware, for eg I can now use the Idea netsetter dongle -
Huawei E1732. The firmware can be found here (shared by a kind Middle East user)
http://www21.link-removed.com/v/26312555/file.html
Instructions: Make sure your hardware version is C1 (check label under the router). The firmware may not be accepted in the normal firmware update mode. Then you'll need to update it in the dlink crash recovery mode
using a LAN cable (not wirelessly).
Assign a static address on the PC for the ethernet interface in the 192.168.1.x series for eg 192.168.1.5
Switch router off, press the reset button ie insert ballpoint pen in reset hole under the router, keep holding the reset button and turn on the router. Keep holding the reset button for about 12 seconds after you power on the router. Now you'll see that the power led has turned red signifying that the router is in crash recovery mode. When you enter the address 192.168.1.1 on your PC browser, you find the upgrade firmware page. Just browse to the downloaded firmware file and flash! Enjoy the many new features!