Chinese android tablet, will not boot,never has. Simply displays a20 logo. Android repair screen can be accessed, but I have not been able to locate firmware to load, which I could load either by abs (microusb cable) or micro-sd card. Motherboard reads UY900 Ver1.12. I have Phoenixcard 3.06 loaded, but pc does not see tablet, using micro usb cable. I have spent hours searching for flash firmware, to no avail thus far. Any ideas? Thanx in advance for firmware.