I am on the process of upgrading ESXi hosts running on 5.5 to 6.5. On one host I am not getting the option to upgrade, for some reason it is not detecting the esxi instance.
Is it possible to backup the configuration of ESXi host while it is running on 5.5 and restore it once it is clean installed with 6.5?
Try upgrading via CLI:
This is for 6.5 to 6.7, but the process is similar for 5.5 to 6.5.