Yes like this the actual module doesn't matter for the DTS but how can I read that out, couldn't find any howto or the like. Never mind I'll find out once you got yours to run. Hopefully I got the right module.
I will provide only firmware for brcm and nothing else. Best way for you to check is opening the case. Don't worry, it's easy (http://linux-sunxi.org/beelink_x2#device_disassembly) and if you use plastic tools like guitar pick, it won't leave any marks. Alternatively, you can read SDIO ID in /sys/class/mmc or something like that (I don't have any device at hand to check) and then google ID to see to which company/device it belongs.