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Restart the appliance, enter the BIOS, and choose to boot from the USB or virtual CD/DVD. Upgrade Path
If you are installing ACS 5.5 today, simply installing the base ISO is not enough. The base version is notoriously unstable on modern VMware hypervisors (ESXi 6.5/6.7/7.0) due to driver compatibility issues. cisco acs 55 iso download updated