Hello Danny,
we have the same issue and struggling to find a solution for 3 months. HPE confirm its not an issue with their hardware.
RAID 1, BIOS is in Lagacy mode, successfully installed R80.40, however after reboot, it is unable to detect the disk to boot.
Tried R77.30, R80.30 but none worked as it throws different errors while installing.
Initially it was with "Array controller HPE SMART ARRAY P408I-A SR GEN10"
Procured new HPE Smart Array P816i-a SR Gen10 as instructed by checkpoint to go with compatibility list but that also did not help.
We are in a critical situation to replace our old Gen 6 HPE servers with new Gen10, but we are stuck.
Checkpoint is currently looking into it again, however, if anyone have any answer for this, would be helpful.
thanks
Jinesh John