ZBook G5 17 - Bios Update horribly downgraded performance and there's no way back!!!

[theroadwh]

I updated to latest Bios hoping to get a better fan profile that wasn't as noisy as the one I had, and now I can't go back!

I understood by the wording on the Bios update that If you were to install the new one you still had to enable HP Sure Admin and then you wouldn't be able to rollback, meaning the "AND" meant I still could go back as long as I didn't install/enable Sure Admin. The small note at the end of the readme file on the Bios update: "NOTE: After this update is run and HP Sure Admin is enabled, the system will not be compatible with older BIOS versions"

Unfortunately, the new Bios makes my laptop run hot, (the new fan profile is very lazy/quiet so thermal throttling is very bad) and to my surprise they also removed the option to undervolt, so my system is crippled on both ends, by more heat (slower fan AND no ability to undervolt) so I lost 1/2 of the performance I bought and that is unacceptable. Please help me rollback, I hate the noise, but I bought this very expensive laptop because of workstation performance, and I lost that performance, or if rollback is impossible, please make a Bios version for ZBooks that can re-enable undervolting, as I've read on many posts people with these and 15" versions ZBooks would become as weak as mine or worse because of these "updates" to the Bios that hurt more than help.

I'm sure if we're given an option for an "unlocked" undervolt Bios with the "possible security risk" highlighted in a readme file, or just for simplicity do a global -100mv Bios undervolt (the CPU is stable up to -160mv!!! ) and that way we get the high performing machine we bought back!