Roll Back to A Previous Version of ESXi

Here are the steps to roll back to a perviouse version of ESXi: (source: KB1033604)

1. Reboot the ESXi host
2. When the hypervisor progress bar starts loading, press Shift + R.
3. On the pop-up warning message “Current hypervisor will permanently be replaced with build: X.X.X-XXXXXX. Are you sure? [Y/n]”
4. Press Shift + Y to roll back the build
5. Press Enter to boot