What is a TPM?
TPM is a security technology that increases the system security against software vulnerabilities.
Practically, the TPM is used for multiple features that increase the security of your device:
- BitLocker Drive Encryption: Automatically encrypts the system drive to keep your data safe.
- Data Execution Prevention: Prevents unauthorized applications like malware from executing in memory.
- Windows Hello: Secure user authentication without password.
- Secure Boot and Measured Boot: Block malicious drivers and rootkits from intercepting the boot process of the Operating system.
I am enrolled to Windows Insider. So I usually get insider updates for Windows 10. The latest update which I received is Windows 11 and it is running great with no issues. I am using Inspiron 3558. 5th Gen i3 Processor. My laptop has no TPM and I did no changes to settings other than accepting the Windows 11 upgrade.
Some Dell systems alike 3558 do not ship with a TPM (Trusted Platform Module) module, and instead, use PTT (Platform Trust Technology). PTT is a lower-cost solution that supports the same functions of the TPM. From an OS perspective, there is very little difference between how TPM and PTT interact with bit locker. If a customer is complaining about being prompted for a BitLocker key (usually after a motherboard replacement) and there is no option for TPM in the BIOS, they may need to enable PTT.
Cause
Resolution
Symptom:
- Prompted for BitLocker recover key on preboot
- No option for TPM in BIOS Setting, which is under security, only PTT
Solution:
If there is no TPM listed in the Service Tag Lookup, please follow the steps below:
- Access to the Bios Setting
- Under Security, verify the Status on PTT Security, ensure the PTT Security is PTT ON and Enabled.
- Reboot and login to the operation system, try to set up BitLocker within the OS.
- Access to the Bios Setting
- Under Security, verify the Status on PTT Security, ensure the PTT Security is PTT ON and Enabled.
- Reboot and login to the operation system, try to set up BitLocker within the OS.
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