| | Re: Problem in updating OS 10.3 on Z10
The 10.3.1 upgrade was pulled by some, maybe most, carriers because of OTA and Link install issues, and new upgrade just now released by BlackBerry. Some carriers are pushing it.
If your Z10 is carrier-branded then your official upgrades are controlled by the carrier.
There are unofficial methods. If you don't know, visit supportforums.BlackBerry.com and go to the BB10 OS board. See the sticky threads on Sachesi and autoloaders. Again, these methods are unofficial, but do work.