I had a similar issue, but with the Intel chassis (R1304SPOSHBN). Fans would constantly spin at 100%.
During the BIOS update/flash process, the SDR was failing with a "Security Violation"; the message was easy to miss because the update process would continue past the error message. Manually applying the SDR (frusdr.efi) also failed with a "Security Violation" message.
Resetting the BIOS to defaults, then re-running the SDR/Flash process resolved the issue.