Hi Peter,  You can download the ISO from Dell here: www.dell.com/.../DriversDetails Remember to upgrade your vCenter and Update Manager to 5.5 before trying to upload the ISO file (under ESXi images).
 Hi I have installed some Dell R710 Server with Dell customised ESXi 5.1 Version.Now I would like to update this Servers to ESXi 5.5 (Dell Version) Question: Where can I find a Dell customized  ESXi 5.5 Version for the VMware Update Manager (.zip) Thanks for help Regards Peter
Dell customized ESXI 5.5 Software for update Manager