This guide should help, particularly post #2..
The ota from 4.1.1 to 4.1.2 mh3 is a bit quirky at times.
If you have not been on 4.3 yet you should read up and decide whether you really want to take the 4.3 ota. Once you have the 4.3 mk6 bootloader there's no going back. There are custom and stock options available here that avoid the need for that bootloader.
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