The Moto Z Droid and Z Force Droid has now started receiving a new software update with the March Security Patch, bug fixes and Stability improvement in the US on Verizon's network. The update arrives as software version NCL25.86-11-4-6. Note that the device still runs on Android 7.0 Nougat. If you haven't got the notification of this new software update yet, Just go to Software updates menu in Settings, and It will automatically start downloading the latest update. The update will take around 10-15 minutes to get Installed on your device. Source
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