We are using a Xibo Digital Signage setup with two Neo X8's with no problems running 24x7 for over a week now. However, we like the specifications of the Z64's better so we ordered three to test. We just received three new Z64's yesterday to test in a digital signage use case (we'll eventually purchase dozens if this works). Here is what we did after unboxing one of the three units; - Plugged in wired mouse and keyboard, video and finally power - Turned on - Set HDMI to use full screen - Attached to WiFi - Downloaded firmware update, applied and rebooted - Performed Factory reset - Logged in - Installed Xibo Android Client, connected it to our Xibo server and ran a standard presentation on a standard 1080p PC display. No issues when we left last night - probably watched it run for few hours. - Came in this morning to a blank/black screen. Power button does not work. Device and power supply did not feel overheated. Need to unplug/plugin device in order for it to reset. Tried a completely different display - still black. Confirmed both displays work on a X8. No matter what we do, the updated Z64 device does not appear to boot - we only see a blue LED and black screen. We are going to attempt to setup the other two, but we are curious to know if this is a known issue with the latest Android firmware or if we should do something different than the stated update instructions?