Software version 12.4.9 does not update
iPad Air software version 12.4.9 will not update further
iPad Air, iOS 12
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Your iPad Air1, with iOS 12.4.9, is capable of update to iOS 12.5.1 - this being the most recent release of iOS for your iPad.
These support pages outline both the available methods by which the update can be performed - and troubleshooting should you experience difficulties with the update process:
Update your iPhone, iPad or iPod touch – Apple Support
If you can't update or restore your iPhone, iPad or iPod touch – Apple Support
If your iPhone, iPad or iPod touch won’t update - Apple Support
iOS update and restore errors – Apple Support
