[SoBird]

Hey,
I've currently got an unbranded media player named simply "MP5" with a RK2706 Rockchip. I've been trying for some time to develop new applications for it, along with a new interface (hence creating or modifying existing firmware), but I am having a severe set of troubles.
Firstly, I can't seem to back up the existing firmware. I've tried to use the "rkusb.tag" trick but it doesn't seem to work. This is making me hesitant at installing any new firmware.
But even so, I'm a little confused at how to develop beyond that as there seem to be so many resources and the information isn't all that well organised (having multiple chipsets and two MyMPX sites doesn't help). I believe I have the RK27xx v2.2 SDK (a 190mb folder with the name RK27SDK_NEW), is this the right SDK? If so, how exactly do I compile the firmware? (I've programmed for many years, but I'm more used to a project file I can open up in an IDE). Finally, once it's compiled, how do I transfer it over to the device? And if it's complied, what degree of certainty do I have that it will work on my device.
I have a full specs of the device if anyone wants to know them, but in the meantime I would really like to know how to get started developing for this thing. A simple "Hello World" program would be a wonderful start.