Hi guys. I finally received some 3-4g modems. And found something similar to the comments here. Changed factory modem on my t902 for another sierra generic ones. And they all work fine. So, no whitelist at all. I also have another t902 with modem slot but no factory modem installed. Tried and didnt recognized any modem at all. I guess I need to do the dmi reset thing. I wonder why this happen. I even used the modem slot on this tablets for msata ssd and worked fine. But modem is a no go. They dont show at all on windows and bios doesnt have any wwan option.