My iphone has error 21 need help please.

my iphone suddenly shut down. i tried to press on button and tried to reset it but it wont work. when i charged it the apple logo appeared i left it for at least two hours. when i came back the apple logo is still there. then i tried reseting it. the connecto to itunes appeard. i cannot restore it. itunes keeps saying an error occured(21). and one more thing. when i unplug in from charger or pc it turns off. as if it has no battery/battery is doesnt work. is it the batt or the ios? please help

JoJo,
I Had your problem to a 100% match. I took my phone to the Apple store yesterday and it actually turned out to be a bad battery connection. The connector was bent, making contact but screwing up the memory. My second battery replacement on my iPhone 4. $89.00 This absolutely and instantly fixed the problem. Please let me know if this helps ( or any of the ther 4 of you wiht this problem. I just created an account so I could answer your question.The Apple guy did tell em he had to put it in UDE mode whihc doesn't matter a bit if you're not there getting teh battery. I don't know what UDE mode is,. but I see it metnioned here a lot.To re-iterate, he said it would have done nothing for me on my own.
jojocarungcong wrote:
my iphone suddenly shut down. i tried to press on button and tried to reset it but it wont work. when i charged it the apple logo appeared i left it for at least two hours. when i came back the apple logo is still there. then i tried reseting it. the connecto to itunes appeared. i cannot restore it. itunes keeps saying an error occured(21). and one more thing. when i unplug in from charger or pc it turns off. as if it has no battery/battery is doesnt work. is it the batt or the ios? please help

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