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Beginner

phone firmware upgrade and call history

I will be upgrading phone firmware on a number of phones as part of a CM upgrade.  Do all phones retain their missed/placed/received call history through this process or do they have this erased?  Are there certain conditions where the call history is or is not erased?  Does this vary by firmware or phone model?

Thanks!

Neal

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Frequent Contributor

I just tried an upgrade from 7.4.4 to 7.4.6 on a 525 and the call history was maintained.