Need firmware for my tablet

[elc1979]

Hi, i need a clean firmware but i cant get it from my tablet because i modified it and now i cant get it back with hard reset, the brand of my tablet is Wolder Mitab Boston and in their page there's no firmware available and they dont want to give me the firmware.

I tried to get the maximum information from app and the pcb, i dont know what is everything but i put the strings i found in the pcb, i cant see the processor because it's protected by a shield but is Allwinner A23, neither board model but the software says sun8i, now i put every string i saw in the pcb:

rtlb189etv (it's supposed to be the wifi card?)
gsl1686 (no idea)
yl-hq023-sp3819 (this is the camera, i had to unplug it to see that string)
hynix H27UCG8T2ETR (this should be the memory, i guess)

I dont know what is the real name of the board, but this is another string writed in the pcb "inet-d71c-rev02 zeng-gc 2014-06-30"

I made many photos of the board, tell me if is needed to upload that shots.

Thanks in advance.