If you’re looking to sell or trade-in your old iPhone or MacBook, you’ll want to wipe your personal data from the device. The easiest way to do that is a factory reset.

Of course that is not the only reason you use your gadgets’ self-wiping features. You could be looking to free up some precious iCloud space. Or maybe your AirPods or Apple Watch just aren’t working properly and you’re thinking a starting on fresh slate could be the solution.
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https://gearpatrol.com/2020/03/06/factory-reset-apple-devices/