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Suspend BitLocker if it has been initiated. To disable the PTT Protection and encrypt the hard drive through TPM: To enable TPM, PTT protection must be removed from the encryption keys. Platform Trust Technology (PTT) is enabled on these systems by default, causing the TPM to be greyed out in the BIOS (Only one of these trust technologies can be enabled at a time). Users may report the Trusted Platform Module (TPM) option in Windows 8 and 10 optimized BIOS is greyed out. Cannot enable Trusted Platform Module through the BIOS
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