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ZTE, you need to support your hardware by updating the software.
The ZTE Spro 2 is running KitKat 4.4.4 which was released October 31, 2013 and is no longer supported by google.
KitKat was replaced by Lollipop November 2014, many of the newer android apps won't install or run on it (you've killed this hardware if you don't update).
The ZTE Spro 2 remote software was last updated to version 1.14 on October 19, 2015, many of the newer phones and devices can't communicate with the Spro 2 making this software useless.
I just bought my Spro 2 and the hardware is absolutely amazing, I hope you folks will seriously update the software to match. Your customers are paying nearly $500.00 for this device and the lack of development is very indicative as to how ZTE will support their line of cellphones (I absolutely would not purchase a ZTE phone knowing that the software will never be updated).