Okay... I bought a new phone, Lumia 1520 and a DT-601 Qi Charger. It works with Lumia 1520 8.1 preview but it still doesn't work with my old Lumia 920. Weird, ehh? I now think the problem is with the phone itself, maybe the part needed for wireless charger is damaged or something.
But I'm not entirely happy with the charger for Lumia 1520 tho. It charges really slow in my opinion. It charges like one percent every 5 mins. I know wireless technology charges slower than with wire but that doesn't seem to be right anyway. Or does it?