princessanne1026,
I have a 2.2" and now a 2.4"
... beside my Meizu M3, which is my audio device.
About what works in one and not in another:
This is the most annoying point of rockchip stuff, things depend on firmware (fw) and customer Update (CU). Try to not get depressed with what follows:
For you to have an idea, gs1960 (member here) has the same device as mine same model (LD-696) maybe the same maker (mine is LDX or LIDAXUN, his maybe is PROWELL), he saves his device with walker.fwr and a specific CU, I try them and they doesn't work for my device.
I did receive the fw from the manufacturer (LDX) and it didn't work for my device either, because mine need a different version of the one they send.
I have counted at least 4 CU all completely different, some of them accept a specific fw, some not, some are call NoDog others simply Firmware Refresh, Zarvas have no name.
So the problem is very stressing but anyway it's a interesting activity.
Maybe is could be better I send you that Zarva package as contains a very special CU (just give me a e-mail address (via PM) capable for handling a file of 1.5 mb.)
My recommendation for the buyers simply is:
DO NOT BUY A ROCKCHIP DEVICE IF IT DOESN'T COME WITH A FIRMWARE AND CU IN THE ACCOMPANYING CD.