Today, Apple has released a 28 MB updated versions as iOS 6.1.2 that fixes a bug that could cause battery drainage in exchange calendar.

Battery drainage is a result of increased network activity in Exchange Calendar.

This update also fixes the security flaw that allows anyone to pass the lock screen without passcode – that was already fixed in iOS 6.1.1 update. So if you haven’t updated to iOS 6.1.1 already, you can update to iOS 6.1.2 directly to get this security flaw fix too.

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