because bbm has a problem
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because bbm has a problem
BB10 Leaked/Beta OS - BlackBerry Forums at CrackBerry.com That would apply to downgrading, but you can only go so far as BlackBerry lock the bootrom from downloading really old versions of the OS.... 10.3 can't go back to 10.2, 10.2 can't go back to 10.1.... in most cases . And developer 10.3.3 can't go back.
But really you might could just replace the BBM Bar File, or do a security wipe, use LINK to reinstall your OS...
What issues are you having with BBM?
What OS are you currently running?