Unhappy Wifi problem

Hello,
After upgrading my Huwaei device u8800 pro (running on android 2.2.1) to 2.3.5, wifi cannot be activated.
I tried to do the hard rest but without result.So i Tried to instal another version (4.0) but the installation setup stop and the message "update failed" appears.

This is my problem exactly :
htt p://w ww.youtube.com/watch?v=JrdRppbAGKY