A custom ROM that is based on vanilla android 7.1.2 is available for download for the LG Nexus 4 phone. It is easily root-able but requires you to have Nexus 4 TWRP custom recovery onboard as that opens doors to flash unofficial things like custom firmware. This very ROM is called Nitrogen OS by its developer and he has also made the entire source code available on github.
Here is how you flash Nexus 4 Android 7.1.2 ROM Nitrogen operating system
* Go to your recovery
* Wipe Data; Install ROM and Gapps zip (DO NOT FLASH SUPERSU, SuperUser is included in the ROM)
* Reboot – 1st boot takes around 3-4 minutes.
* Flash ROM, gapps, unsu zip, SuperSu and reboot
You will find the SuperSu in the application drawer and it will work like a charm – without any problems. If you restart / reboot your android phone, this very application icon will disappear from the list but your Nexus 4 will still be rooted.
So there you have it – the latest android 7.1.2 firmware for your LG Nexus 4. It is best ROM right now and nearly bug-free. We love the fact the Nexus 4 Android 7.1.2 ROM Nitrogen operating system has root out of box.