Can’t update , their is no option of update in phone and can’t create a iCloud acc
Can’t create iCloud acc and can’t update
iPhone 6 Plus, iOS 12
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The iPhone 6 Plus is not capable of running iOS 13 or above, that one is stuck on iOS 12.5.5
To make an Apple ID , see this link and follow the instructions provided
How to create a new Apple ID - Apple Support