Dell XPS 13 9360, previously running dual boot Windows 10 and Ubuntu 16.04.1 LTS. After upgrading to 1.2.3 BIOS, the laptop fails to boot. I receive a BIOS message 'No boot device found'. This is using AHCI for the drive configuration.
If I change the drive configuration to RAID instead (and nothing else), I receive the error 'Inaccessible boot device' from Windows 10 -- which isn't hugely surprising as it's configured for AHCI and doesn't have the intel RST driver installed.
I've tried downgrading the BIOS to 1.0.7 but received a message 'Incompatible downgrade'.
Any ideas as to why it can "see" the boot device in RAID mode, but not in AHCI?