I have an Insignia Flex 8" NS-14T002 tablet which I have successfully rooted using KingoRoot. The device is currently running Android 4.4.2 KitKat stock ROM provided by the manufacturer. I wish to upgrade it to the next level, i.e., install vanilla Android 5.1.1 Lollipop.
But unfortunately ClockworkMod doesn't support the device. So I am unsure how to install the ROM into my tab as I have never done so before. Also, is there a separate vanilla ROM for each device?
Can someone give a step by step procedure of how to install a ROM manually without CWM?
Please comment in case you need any further details.