ok thanks guys, my problem is solved. I have reload my os to my BB and it works again, thanks a lot.
the problem was i didn't delete my vendor.xml file.
My second problem is, i have some excel files om my pc that i want to open at my blackbery, but how can i transver them to my blackberry, and how can i read it. what do i need?
The 7290 has very limited built-in memory. Please keep in mind that the more files you save in there, the less memory you have for your device's proper functioning.
Anyway, you'll be needing a 3rd party app to read your excel in there. I'm not sure which is the best one, I'm sure others can pitch in.