After iOS 9.3 update, several problems like activation errors, verification errors, update unavailable issues affect older iDevices.They include iPad 4, iPad Air, iPod touch 5,1,iPad mini 2,iPad 2, iPad mini ,iPad 3, iPhone 4s, iPhone 5, iPhone 5c, iPhone 5s. Techslates provide you official way to get iOS 9.3 ipsw 13E237 download from Apple store. Updating using ipsw firmware files is tedious and also not recommendable.Proceed at your own risk.
iOS 9.3 ipsw download for iPod Touch and iPad Series
Check this guide on how to use ipsw files
To fix other issues, you can downgrade your iPhone/iPad/iPod touch from iOS 9.3 to 9.2.1/9/9.0.2
iOS 9.3 ipsw download for iPhone Series
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