Sony XPERIA E4 Dual is them most cheapest Dual SIM smartphone in Sony Mobile portfolio for 2015. It has enough powerfull quadcore CPU from Mediatek and 1 GB RAM. Phone also support screen recording and fast user interface. Also battery life is excellent, but there is also much better smartphone, which is not so expensive to - XPERIA E4g Dual. Below you can find the latest firmware for the phone and how to backup the original firmware customization.