NEXBOX A5 uses Amlogic S905X chipset, which is a 64-bit quad-core CPU with a frequency of clock of 2.0 GHz. It supports 10-bit 4K@60HZ H265 and VP9 decoding, Gigabit Ethernet (RGMII), Android 6.0, HDMI 2.0a, built-in DAC and more. NEXBOX A5 may be the first Android 6.0 TV Box model in 2016.
Here is the firmware link of A5(1G+16G). Click here.
However, the firmware for A5(2G+16G), Click here.