Hi, Our image primarily adds Dell specific drivers and shouldn’t affect the ability to do the upgrade. It does show it as a supported upgrade path in the release notes. [URL]
Our initial VMware installation was performed using the ESXi 4.1 .iso image, can we safely upgrade to ESXi 5.5u2 using the Dell .iso image?  VMware ESXi 4.1u2 to Dell ESXi 5.5u2 We've run the pre-upgrade checker on the 4.1 hosts with zero problems found, but this is about using the Dell specific image to upgrade a VMware image install. Thanks
ESXi 4.1 to 5.5 Upgrade