Lollipop for Unite 2 :
To update your Unite 2 download the firmware from the below link and flash it using SP flash tools.
Also please note that this firmware is only available for Unite 2 8GB version not for 4GB version.
How to Flash . ?
To flash this firmware you need to download SP flash tools and official drivers for the device.The procedure and the required softwares we already given in our site kindly check it here. - How to Flash using SP tools
If you dont have a PC or Laptop and having fear on flashing using SP Tools then you have to wait till Micromax seed them via OTA.So no need to worry on updating your device.