Presenting the best AOSP firmware made for this phone. After initial release the firmware was downloaded 1800+ ( and counting) in just 14 days. Dont beleive ? Have a look at the description of Yandex file
Features :- Green LED notification for calls and messages, the latest busybox, magnetic unlocking ,Inits.D scripts, with USB-OTG function, core 1r4, Multilangugae, pre-rooted, the application uses a great navigation, the most interesting thing I've noticed is fast GPS lock signal, Terrific memory management. With a total 179 applications (screenshots) of memory 500 -600 MB Superstable and without any lags Firmware is perfect for daily use, very good battery life during active use, 4.4.4 launcher, notice rely on icons for calls and messages.
Installlation :-
1. Place the zip file of the external SD card
2. Start the phone in recovery mode. TWRP 2.8.4 Rev 2 CN / 2.7.x ROW is mandatory
3. Wipe everything except the external and internal SD-card
4. Install the zip file and restart after finishing