Here is a list of resources to help you troubleshoot your Zooz ZST39 Z-Wave Long Range USB Radio Stick and navigate the documentation that’s already out there 
We try our best to keep the Zooz Support Portal updated and continue adding helpful articles every day so take a look at the most popular docs first, there’s a good chance your question has already been answered! 
ZST39 FAQ: the best place to start 
OTA Firmware Update Files: read all of the disclaimers carefully before applying an update to your device to avoid accidental bricking 
ZST39 Change Log: where we keep track of all the updates made to the hardware and software of the device.
ZST39 Specs: make sure this device is a good fit for your installation.