While ESS provides the base "bootable" ISOs, incremental updates and patches are found elsewhere.
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Run smitty update_all from the directory containing the new filesets to apply the updates. Key Technical Details for AIX 6.1 Downloading an AIX ISO for a specific OSLEVEL - IBM While ESS provides the base "bootable" ISOs, incremental
Select or IBM Operating Systems -> AIX -> Version 6.1 . aix 61 cd iso download upd