It's no secret that the BlackBerry Z30 update to BlackBerry OS 10.3.1 didn't go so well for many users. We've heard dozens of reports of users having defective screen issues after they updated to their latest OS. If you are one of those unlucky users who currently has a Z30 as a paperweight, you might be able to apply for an extended limited warranty from BlackBerry provided you meet their criteria. As mentioned in the BlackBerry Knowledge Base, if after updating to BlackBerry 10 OS version 10.3.1.2243 or 10.3.1.2267, you experienced an issue wherein the screen did not power on, you can apply for an extended warranty.
Please note: conditions that will void BlackBerry’s limited warranty include: signs of misuse (cracks, bite marks, tread marks, etc.), indications the device has been submerged in liquid, opening of the device by non-authorized service providers, exposure to extreme heat and purposeful removal of device identifying serial numbers.
Source: BlackBerry KB