Hello.
It looks like a new BIOS for the i7-8700K generation showed up on firmware downloads sometime after 3/25/2019. It's version 2CA and the full filename is E7B43IZ1.2CA.
As of today, the MSI LiveUpdate utility is not picking it up as a BIOS update.
The download package is just the BIOS file - no changelist, no installation instructions.
Is a changelist available?
The motherboard in this machine is an MSI 7B43. MSI has updated the firmware for that board 5 times since I purchased the Corsair One. There have been no updates from Corsair until now.
Perhaps the best answer to this question would be to tell us which of the multiple MSI updates this Corsair update is based on. Those updates are listed here:
https://www.msi.com/Motherboard/support/Z370I-GAMING-PRO-CARBON-AC
Aside: I was, and still am, thrilled with the One form factor and features. The lack of updates is awful, though. I actively recommend colleagues and friends away from it specifically because of this. If Corsair addresses this, you will have the unconditionally best small-form factor / high performance PC on the market. I hope you.