While investigating T225713 I couldn't set the power regulator from ilo ssh. Upon reboot the host came back in UEFI mode and started debian-installer over the network, which I suspect got far enough to wipe partition tables so we'll have to reinstall the host anyways.
I've rebooted and set bios mode back and "os control" for power regulator, at boot I'm seeing this error:
A search suggests upgrading firmware and resetting bios settings, https://community.hpe.com/t5/BladeSystem-Server-Blades/POST-Error-338-HPE-RESTful-API-Error-Unable-to-communicate-with/td-p/6956876
@Papaul what do you think? have you seen this before? thanks!