[Q] why some atrix 2 ics are at 1Ghz and some are at 1.2Ghz at ics update?

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http://forum.xda-developers.com – as i heard the some atrix 2 are updated to ics with 1.2Ghz with ota update. But some device are remain on 1Ghz. Whats the reason? and how to get 1.2Ghz while updating. (HowTos)