Reverting to a previous build does not revert the tools-light vib version installed on the ESXi host
Reverting an ESXi host is only valid if the host was updated using these methods:
VIB installation or removal
Profile installation or removal
ESXi host update using VMware Update Manager
Updated from a ISO
Reverting to an earlier version is not possible after upgrading to ESXi 7.0 due to partition changes to the boot device.
Note: To use an earlier version of ESXi after upgrading to version 7.0, create a backup of the boot device before the upgrade or reinstall the desired version.
Rolling from ESXi 8.0 to 7.0 is acceptable, as there are no partition changes between the two versions.
In the console screen of the ESXi host, press Ctrl+Alt+F2 to see the Direct Console User Interface (DCUI) screen.
Press F12 to view the shutdown options for the ESXi host.
Press F11 to reboot.
When the Hypervisor progress bar starts loading, press Shift+R(This must be done while the bar is loading, and not after. Optionally, press Shift+R repeatedly once "system is preparing to boot" to ensure not missing the time frame to execute the command). A warning will appear:
Current hypervisor will permanently be replaced with build: X.X.X-XXXXXX. Are you sure? [y/n]