This is a known issue.
Please see the KB:VMware KB: Upgrading a host using HP Custom Image VMware ESXi 5.5 Update 1 fails with conflicting vib error for broa…
As said in KB:
To work around this issue, use one of these methods:
- Contact HP support and request an updated HP Custom Image for ESXi 5.5 Update 1.
- Upgrade the host using the HP 5.5 Update 1 March 2014 image and then apply latest patches.
- Build a custom ISO with HP 5.5 Update 1 June 2014. Remove the Broadcom NX2 packages and replace with the older version from the HP 5.5 GA build available at VMware Downloads. Use this modified image to upgrade the hosts,
Hope this helps !!!