If you are seeing the word "proper" in a command line output or error (e.g., regarding a VIB signature or acceptance level), it might refer to VIB Acceptance Levels .
There are several types of ESXi images, including: esxi images
⚠️ Always check the VMware Compatibility Guide before choosing any image. A wrong image = PSOD at 2 AM. If you are seeing the word "proper" in
If you need to create a "proper" custom image (for example, if you have specific hardware requiring third-party drivers): esxi images