https://www14.software.ibm.com/webapp/set2/sas/f/power5cm/supportedcode.html
Are you Power 5 or 6?
Look not just at "Latest release levels" but also at "Supported code 
combinations".  I had let my firmware and HMC code get behind for awhile 
and I ended up having to upgrade HMC to an intermediate level, upgrade 
firmware a little, upgrade HMC to latest and greatest, finish upgrading 
firmware to latest.  Some might see that as a pain versus just applying 
firmware via cume.  As stated in earlier threads, I see it as a way to 
make sure that my HMC would continue to work with the firmware.  Otherwise 
you could get to a firmware higher than your HMC supports.
Rob Berendt
 
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