My phone is YU Yureka (AO5510) Which comes with Cyanogen pre-installed but not rooted. I bought it 2 years back and I am still at CM 12.1 which is based on Android 5.1.1 Lollipop and I am not getting any OTA updates.
I would like to change from CM 12.1 to Lineage OS 14
The question is, because of some internal issues, Cyanogen OS is dead and the code then forked and maintained as Lineage OS. Also the codename is same (Tomato for my device).
So, should I unlock the boot loader to install the Lineage 14 or without unlocking am I able to install it?