Hi here is some help for you, so what you have to do is follow the steps that I am giving you here, I am sure it will work out for you.
1) First of all download this file from
here
2) Rename that file.
3) Copy that particular file to the sd card.
4) Now keep pressing the volume button along wit the power button. Now keep holding them until the logo of acer appears.
5) Now the installation process will get started.
6) Ice Cream Sandwich is fully installed in your tablet.
I hope this one works for you.
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