help me to find firmware

need firmware for azpen tablet
tablet. name......azpen a720 (black)
chip-rockchip rk3066
on pcb written-TR736 V18 20130130 HZF

Serial #: a72001305040126

Cpu: Dual Core 1.6Ghz
7"LCD 800 x 480(16.9)
5 point capacitive touch screen
Ram 1GB DDR3
storage 8GB
Camera 0.3MP(front)



thank you.......