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In this case you can contact reseller for warranty.
As I mentioned you should downgrade to older ROM before doing anything especially that you mentioned that phone restarted after reconnecting battery so this doesn't look like be motherboard failure.
In here you can buy motherboard so if reseller partially refund money you can buy parts yourself
https://m.aliexpress.com/search.htm?keywords=Umi+max+motherboard+
But as I said you need flash you system please change SPFT option to format all + download.
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Post time 2017-1-22 23:35:53
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