My iPhone went off while updating using iTunes but in unknown error (1) occurred in the process. Now the screen came back on with just the apple logo and still loading. Is that a cause for worry
iPhone XR, iOS 12
If it completes the update, you should be OK. Otherwise see this article (for error code 1):
iOS update and restore errors - Apple Support
Nanaawuku Said:
"Updating iPhone : My iPhone went off while updating using iTunes but in unknown error (1) occurred in the process. Now the screen came back on with just the apple logo and still loading. Is that a cause for worry"
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The worry is that you need to install this. So, try it once more (but, this time, use a computer): Go Here: Update your iPhone Using a Computer - User Tip
Also, Refer to these Two Sites:
Updating iPhone
