I have just upgraded my Blackberry 8700 handhelds software from version 4.1 to the latest version 188.8.131.52. The installation was successful but there is only one problem, the sound notification for my mail doesn't sounding at all. The sounds for SMS, MMS, phone etc. do sounding properly, it's only the sound for my mail I can't hear. I have also tryed to change the tones, also tryed to change from low to high, but I can't hear any tones for my mail.