Select "Apply update from SD card" or "Install from Local Storage." Navigate to the and select it.
Navigate to (or Local Upgrade depending on your skin).
If you are looking to upgrade your firmware, fix software bugs, or get a newer version of Android on your ZXDZ 01 hardware, here is a comprehensive guide on where to find the links and how to perform the update safely. Where to Find the ZXDZ 01 Update Link