Hi everybody,
For no reasons, a lot of problems somehow occurred in my phone such as:
1) Whenever I opened App. Manager to use the Download or Update part, it always announced that "no appications available" even if I have tried to refresh or dis/enable the application catalogs's list for so many times. Like the picture:


2) I updated my phone from 20.2010.36-2.002 to 21.2011.38-1.002 to see whether the problem above could be solved or not. However, after updating, the problem #1 was still there, and my phone even became more worse because I couldn't restore the back-up file at all (couldn't get into App. Manager to install apps, restore songs, movies, pictures etc.). Therefore, I want to flash and reset my phone, version 21.2011.38-1.002, again but I don't know how.

3) Before updating to 21.2011.38-1.002, the widgets on my desktop were sometimes disappeared for no reasons, and I swear I didn't touch or do anything. It was just been like that. Moreover, the media widget also couldn't be controlling sometimes. To play music by the widget, I had to go into the media player, press play and then quit the app by "End Current Task"; however, the widget still couldn't play music again if I paused music.

Please, help me out of these problems, expecially the problem #1& 2. I'll really appreciate your help.
I'm looking forward to your help.
Thanks first.