iPhone camera stopped working after iOS update

First try a Forced restart Force restart iPhone – Apple Support (UK)

If no better you should arrange a repair iPhone Repair - Official 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

DakotaHicks ~ Does your iPhone 7 Plus still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health

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