BOSTON (CBS) – Apple’s new iOS 10 software update caused some major problems on the first day you could download it.

Some customers complained on social media that the update froze their iPhones.

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The error messages said the phones might need a factory reset, which wipes out the phones current content and settings.

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Apple said the issue has been fixed.

“We experienced a brief issue with the software update process, affecting a small number of users during the first hour of availability,” Apple said in a statement to CNET.

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“The problem was quickly resolved and we apologize to those customers. Anyone who was affected should connect to iTunes to complete the update or contact AppleCare for help.”