Dissapearing BBM?

[SophieHasABlackberry]

I have a blackberry curve 8520;and when i went to upgrade the new BBM, i deleted some download i already had, and then the phone rebooted, but when i went back into blackberry app world, it was still upgrading the new BBM but the bbm had dissapeard! i really dont know where it has gone! + the new upgrade availabe wont download! theres an error? please help! thanks

[Krack-Berri]

Try hard reseting the phone and downloadin bbm from the blackberry website and connect your phone via usb..