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I have now backuped and analyzed my bios. I have the same SATA mode values than you. But unfortunately the change of the value failes in EFI shell (you need a newer one, the old one won't work - only black screen).I see that the current value is 0x2 -> which means raid mode. Seems that our Bios is locked and encrypted (so no changes wie via EFI shell), their are reports also in other forums and no bios modifications without hardware programmer. So i think we are lost until their is an update from Lenovo, which i think is very unlikley. The don't have added also dvmt settings option which many user are requesting. I think i will send my 900S back. 1300 € for a locked down device is too much.