ACI Upgrade Guides

Upgrading APIC CIMC

https://www.cisco.com/c/en/us/support/docs/cloud-systems-management/application-policy-infrastructure-controller-apic/215178-upgrade-cimc-on-apic.pdf

Verifying md5 checksum for ACI image in the APIC Firmware repository

https://community.cisco.com/t5/data-center-and-cloud-knowledge/totd-how-to-verify-the-quot-md5-checksum-quot-for-aci-images-in/ta-p/3164507

Cisco ACI Upgrade Checklist

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/kb/Cisco-ACI-Upgrade-Checklist.html

Cisco APIC Installation and ACI Upgrade and Downgrade Guide

 https://www.cisco.com/c/en/us/td/docs/dcn/aci/apic/all/apic-installation-aci-upgrade-downgrade/Cisco-APIC-Installation-ACI-Upgrade-Downgrade-Guide/m-pre-upgrade-checklists.html#Cisco_Generic_Topic.dita_6a12a5c2-95d4-41b9-910b-cb3aa8f122a0