The Quartz is ZTEs first attempt at Android Wear 2.0 wearable. It was launched earlier this year, and the company taking good care of its security. ZTE pushed an update which brings some major fixes to the Quartz software.
According to the release notes, the update includes Google security patches, Bluetooth connectivity and sync enhancements, bug fixes and performance improvements.
The update is over-the-air, so you can get it when you log in a Wi-Fi network and follow the Settings -> System -> About -> System Updates steps in the menu.
The only requirement for the install to start is to have a full charge of the ZTE Quartz battery.