Can't confirm on that. 10.10.3 update incl. recovery partition update
worked fine for me on several iMacs and MacBook Pros while having
firmware password enabled. (But we are not using FileVault, so maybe
this issue is related more to encryption than...
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I'm a technical coordinator in a medium sized mac only environment with about 50 clients and some servers. Besides that I'm doing lots of music and writing a column for the german issue of WIRED magazine.