alpha version
This is a pure test version. Don't complain about functions not working. It's a real JB4.2.1 ported from ZTE V987.
The ROM is very lightweight, antutu scores are 14K+. RAM usage after first restart is less than 300MB. Multilanguage support (Europe + Chinese).
It's rooted, so you can install gapps if you want. Network location should work after that.
Already working: audio, video, modem, Wi-Fi, GPS, light sensor, proximity sensor, touchscreen, FM Radio (with headphones for antenna), storage mounting, bluetooth
Things not working: screen rotation, camera (not present at all), accelerometer, gravity sensor
Things not tested, but might be working: games, dual SIM
————————————————————————-
Installation
In order to install it, you need a proper recovery for Lenovo A820 first. Please download attached cwm recovery 6.0.3.2. Install it with SP FlashTools or if you have a rooted rom, rename the file to recovery.img, place on sdcard and install through MobileUncleTools. I've added model verification in the update script and the rom will not install without a properly modded recovery (5.5.0.4 from my previous rom is not proper and not modded by me).
Copy the rom zip to sdcard and install from recovery.