You need to do a hard restart but with home button not working you can not do it you can try . But if you keep screen lights on and kill the battery then bring itunes up plug dead ipad into your computer when it boots itunes should catch the update and repair the problem with update but with home button not working last time i saw that the battery was leaking acid in the bottom of ipad you should lift screen and look if you dont know how take it to a place that replaces screen and ask them to look in it
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