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What is the easiest way to reinstall the OS on my samsung tablet SM T530NU I don’t know how it got deleted but kids are pretty good at being kids so please HELP

You need to preform a factory reset and this video will show how. https://www.youtube.com/watch?v=8iOZAJqG… Please be aware that any data you had on the tablet will be lost and it will return to the state it was when you first purchased it . Hope this helps