The VMware Knowledge Base provides support solutions, error messages and troubleshooting guides
Aborting an ESX Server 3i Bootup after an Upgrade Invalidates USB Key for Further Upgrades (1003085)
If you abort an ESX Server 3i bootup by booting into the previous boot image (by pressing Shift+R), the firmware that is on the originally active bank cannot be upgraded.
Upgrade to a newer firmware version than the previously active version. For example, if the active bank has firmware version 2 and you reboot, press Shift+R, and boot into the other bank containing firmware version 1, you must then upgrade to firmware version 3 or higher.
Request a Product Feature
To request a new product feature or to provide feedback on a VMware product, please visit the Request a Product Feature page.