The Yu Yunique is a budget phone that has been very popular in emerging markets. The device has gained popularity thanks to CyanogenOS which it runs as its stock firmware. CyanogenOS is still on Lollipop, but you can actually run the latest build of Android Marshmallow 6.0.1 security patches and all thanks to an unofficial build of Cyanogen Mod 13. The developer claims that this unofficial build of CM13 is stable enough for use as a daily driver.
There are apparently no major bugs in this build however I would still recommend that you fully backup your device before proceeding with the install. Of course you will need a custom recovery installed to your device to install the Rom. Head to the link below for the Rom download.
via XDA