For your information, I have a DL380 G7 and it runs fine under 6.5u1 "standard image"
But I got a PSOD with the 6.5u1 HPE custom image: it installs, but the ESXi fails at the first boot.
If you are still having this problem, here is what I will recommend about this issue :
- Upgrade the firmware on the server as per your hardware vendors recommendation to the best suitable & stable release.
- Post that you can go with the standard install of ESXi for version 6.5 U1 on the HP server.
- Then go for upgrading the drivers on the ESXi host.
Note : In case if something goes wrong with the upgrade make a note of the issue collect the vm-support log bundle if possible and roll back to the previous version immediately, to bring it back into production.
Also, I would recommend placing the driver for all components on a datastore that is local and a shared one as well, to the server for just in case situations.
Hope this helps.