It seems that from Bios version 1.09 you cannot simply switch SATA modes anymore. The option just is not there anymore.
After hours wasted searching for a solution I found a hint in some forum (sorry… don’t have the link anymore).
The solution is easy:
- You enter Bios
- Switch to “Main” tab
- Then press “CTRL + S”
- The option mysteriously appears
Not sure what the idea behind this was from the engineering team. Not even any hint in the Bios text descriptions.