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I bought an iPhone 7 with a broken system. I thought that it would be easy to repair after doing it on my SE, but so far, every tutorial, tool, etc. didn´t work. In iTunes it says An unknown error has occured. (21). I saw somewhere that this is caused due to the battery being bad, is it true? 

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https://linustechtips.com/topic/1124981-iphone-7-itunes-recovery-mode/
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