Dell D13S Service Manual page 78

Beginning May 2018, new systems with Windows 10 shipped to China region will be defaulted to firmware TPM (fTPM). The fTPM
improves and provides added security.
To check fTPM setting in BIOS Setup:
User can check the fTPM setting in the BIOS under the Security option, as shown below. The option lets you control whether the
Platform Trust Technology Feature (PTT) is visible to the operating system.
NOTE: The Enable Legacy Option ROMs option should be disabled to make the above setting.
78 Removing and installing components