Yes, Turboccc solution works, but it's different. The solution offered by some retailers is different.
You can flash old SG/MY/TAI firmware to get the 3D functions of 3790T probably because they don't have official 3760T.
Because of that the firmware does not check anything and enables all the available bells and whistles by default.
Some people offer upgrade to SG firmware in order to get extra functions like MP3 player, but by doing a different mod (I bet disabling the check between 3760 and 3790 on bootup or something else), they keep the original firmware, and apparently it passes the automatic webupdate upto the latest 3.60 firmware.