If you're talking about the firmware, I would not try to upgrade it. You will most likely brick your player.
If you're talking about themes, it depends on what version your clone has on it. 9.15.2 cannot be themed at this point because an extraction tool is not available.
__________________
 ops: 1GB Black Hacked Chipod ops:
2 GB Black Temptation Player 
8) WHITE MEIZU M6 8GB 8) |