HELP! My A1-811 keep rebooting itself

I need help! Ajter trying to update to KitKat 4.4.2 manually using this article http://acer.custhelp.com/app/answers/detail/a_id/29931#_ga=1.159508285.1207883840.1437316707 my tablet get rebooting forever. I did everything also I have downloaded the pdf file from Drivers and Manuals Section and did exactly what it says, but the update wont install, just the image with the fallen android and some information like that one from the manual. So after that I just pressed reboot system, and .... nothing. It keeps rebooting itself. Help me is there any chance to fix it?  P.S: In the Drivers and Manuals section there are two files for different image files only. I get the WW_GEN, because before trying to update I have checked the last image in my settings, and it was ending with WW_GEN. 

Nope the factory reset didnt help What have I done? Only get worse with deleted data!!!  The tablet get stuck on the logo and continue to reboot. I have did everything - when the factory was done I have choose then to reboot the system, but that reboot continue on an on... please what to do? P.S: The factory reset was done without the sd card in tablet, if that matters.

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