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Apple today seeded the second beta of an upcoming iOS 9.2.1 update to developers and public beta testers for testing purposes



From MacRumors:
The second iOS 9.2.1 beta, build 13D14, is available as an over-the-air update for those who downloaded the first beta and it's also available from the Apple Developer Center.

It is not yet clear what changes iOS 9.2.1 will bring to iOS 9, but as it's a minor .1 update, it's likely to focus on performance improvements and introduce fixes for bugs that have been discovered since the release of iOS 9.2.
  Apple Seeds Second Beta of iOS 9.2.1 to Developers and Public Beta Testers