Uninstall iOS update
My iPhone 5s ran great until this most recent update. Now it’s crawling like a cheap android. How can I uninstall the update or start back at iOS 9?
iPhone 5s
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Apple does not support downgrading.
Perhaps something went wrong during the last update.
Create a full backup of your iPhone, then restore it to factory settings and, in the end set it up as new, following these instructions:--> Restore your iPhone, iPad, or iPod to factory settings – Apple Support
The above procedure, reinstall a fresh copy of the latest iOS version on your iPhone.
When done, restore data form your previously created backup.
Regards
Giulio