Nexus 5 update M from dev preview?

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nexus 5 update M from dev preview?

I flashed my N5 the dev preview the day it announced, got couple of OTAs and now it's running "MPA44I". I heard it was final preview version but now that official factory image is released, the build number of that is "MRA58K".
Am I supposed to get OTA to that official build or flash it manually? I thought the transition from dev preview to official build seems more natural, so I thought it would be done in this way, but confused with different build number.