[Q] assistance / guidance for a clone android phone topic

HI all , I would like to ask for assistance / guidance , last year I acquired a Chinese lenovo a820 clone , at the time I thought it was original lenovo a820

I looking for a "clean/low weight" rom with only the essential ... for this phone .. also if possible some link with instructions how to install it ( rom ) ...

The phone as only one main problem , the microphone does not work very well people are always complaining that they hear me very low ... is there a solution for this ?

Ps : my apologies but my "android level" is very very basic.

the specs are :
CPU: Quad Core MTK6589
Cellular: GSM 900/1800mhz
Display Resolution: 960x540
Touch Screen Type: Capacitive Screen
Screen LCD Type: IPS
Display Size: 4.5
SIM Card Quantity: Dual SIM Cards
RAM: 1G
Band Mode: 2SIM/Single-Band
CPU Manufacturer: MTK quad core MTK6589
Camera: 5MP
Talk Time: 5-7hours
ROM: 4G
Operation System: Android 4.2

thank you
Roque

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