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the motherboard of my iphone 6 is not working. Its confirmed by the Apple store staff after doing some tests. I dont know what to do with this phone. It is in really perfect conditions cause its brand new. It is broken after a failure during the software upgrade process. I was thinking to to replace myself the motherboard. I dont know where to find one but before starting to search for it I would like to know if I can use a iPhone 6 s motherboard so this way I can upgrade it. Thanks

No, you can’t fit a 6S logic board into the housing of an iPhone 6, they have almost nothing in common besides the size. It might be worth looking for a repair lab that does microsoldering and try fix your iPhone board, as many work on a no fix no fix basis it might be economically fair in the end with an iPhone in mint condition. If you’ve not tried it yet, before thinking about a repair try restoring with 3Utools, there are times when it reaches where iTunes fails.