About the Silent Roll Package Upgrade or Downgrade
Cisco APIC release 4.1(2) introduces the silent roll package upgrade (SR upgrade) feature. An SR upgrade enables you to manually perform an internal package upgrade for ACI switch hardware SDK, drivers, and so on, without upgrading the entire ACI switch software OS. Typically, you do not need to perform an SR upgrade because upgrading the ACI switch software OS takes care of internal packages as well.
As of Cisco APIC release 4.1(2), the SR upgrade feature supports the following two switches:
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N9K-C93216TC-FX2
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N9K-C93360YC-FX2