Thanks a lot for your answer, sir!
I've done the update, and it's satisfy..I feel the phone became faster to load or something.

But, I wonder why my BB screen name changed by itself, and when I was going to use my old name, the screen name has been used...
Example:
At the very first time I have Michaelis for my screen name.
After update, it changed became Michaelis-93578
But when I try to change it back to Michaelis, the screen name has been used.
Weird...