Can ipad air (4th generation) update to ios18?

When iPadOS 18 is released later this year, your iPad Air4 will be capable of update to this new major version.

At present, iPadOS 18 is only available as a Developer Beta. Even when Public Betas become available later in the development cycle, it is generally recommended that you do not install Beta software on your primary device(s). By definition, Beta software is unfinished; you will likely encounter bugs and compatibility issues.

Yes, but it's not yet publicly available.

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