The iPadOS 18.0.1 update can be downloaded over-the-air by going to Settings > General > Software Update. iPadOS 18.0.1 is available for all iPad models able to run iPadOS 18. Apple first released iPadOS 18 on Monday, September 16, but the update was removed the next day. Some M4 iPad Pro owners found that iPadOS 18 rendered their devices unusable. More @Wikipedia
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