How to update IOS 9.3.5

An iPad 2, iPad 3, or first generation iPad mini isn't capable of 10 or above. If you're using a newer model, remove the beta profile from it and check that it can properly communicate with Apple's servers.

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Sorry.

Over 8, 9 and 10-year old iPad models are just too old, now.

Sorry, but this is the reality for ALL 8-10-year old AND OLDER iOS devices now. Especially going into 2021!

If you need/want an iPad with an up to date iPadOS with access to current, updated apps, then you really need to seriously consider a new iPad model OR a much “newer” , used iPad model capable of running the latest iPadOS versions. There are plenty of newer, older iPad models that can run the latest, current versions of iPadOS.

Sorry & Best of Luck to You!