acer a100 tablet system update failure

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http://androidforums.com – I have an Acer A100 tablet that has been moded. My daughter brought it to me and it had the picture of the Android on the screen. I turned it off and back on. When it came back on it gave me a "system update failed" error message. Now I cant do anything with it. I finally got the keyboard working but it wont let me do another system update. When I try to it just tells me "network coverage is currently poor. please move to a location with better coverage to continue". I am standing right by my modem and have a strong signal. Any help would be great. Right now i jus (General)