i downloaded the update on my iphone and now it won"t come back on
I downloaded the new update and now my iphone will not turn on
iPhone 6, iOS 12
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If your iPhone won't turn on or is frozen – Apple Support (UK)
If no better you should arrange a repair iPhone Service & Repair - Apple Support
Or
Contact - Official Apple Support
Anything other than Screen or Battery may be a replacement phone and the price is in the article under "Other damage"
See also: Get your iPhone, iPad, or iPod touch ready for service - Apple Support