I'm not used to this HP version of ESXi, but I'm pretty sure you can do it with no problem. Anyway, if you are not aware of loosing your configurations on this ESX you can reinstall it from zero and just maintain your VMFS intact in case you have VMs on it - than the work is to register all vms and reconfigure networking/storage.
Hope this helps,
Marcelo Soares
VMWare Certified Professional 310
Technical Support Engineer
Linux Server Senior Administrator
Marcelo Soares
