As per the Crackberry article How to get the latest BlackBerry 10 software on your Z10 even if your carrier hasn't pushed out the update | CrackBerry.com, does the Mac version of Blackberry Link work? I hear there are problems with the Mac version, and I myself almost bricked my device two weeks ago when it told me to update to a firmware which was actually a dev alpha OS from October 2012!
Cheers :)
Cheers :)