Software update notification

Princeyeboah Said:

"Software update notification: Notification of software update is unavailable"

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Ignore the prompt.

Incompatibility is the Culprit:

This is not an option for you. You need to upgrade to a compatible iPhone, as an iPhone 6 cannot go past 12.5.5

iOS Compatibility:

• iOS 12: Supported iPhone models - Apple Support
• iOS 13: Supported iPhone models - Apple Support

This was not me