It helps to show which firmware (microcode) should be updated:

1. Download: http://public.dhe.ibm.com/software/server/firmware/catalog.mic
2. Copy on the server to: /var/adm/invscout/microcode
3. Run: invscout (it will collect data and creates: /var/adm/invscout/<hostname>.mup)
4. Upload <hostanme>.mup to: https://www-304.ibm.com/webapp/set2/mds/fetch?page=mdsUpload.html

http://aix4admins.blogspot.in/2011/10/firmware-adaptersystem-firmware-lsmcode.html
Microcode Discovery Service (Link) : https://www-304.ibm.com/webapp/set2/mds/fetch?page=home.html

Adapter Microcode Update
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http://www.unixwerk.eu/aix/microcode.html