Use TPM with ChromeOS Flex

Trusted Platform Module (TPM) is a standard hardware component that’s included in most enterprise computers to more securely store and process cryptographic data.

You can use TPM on a limited number of ChromeOS Flex certified devices. 

ChromeOS Flex supports only certain TPM 1.2 and TPM 2.0 chipsets. Google continuously adds support for a wider variety of TPM chipsets on devices.

Why you might need TPM

If you want to use hardware-backed certificates, you need to install ChromeOS Flex on devices with a supported TPM chipset. Hardware-backed certificates bind to unique user or device pairings, ensuring that certificates can’t be moved to unauthorized devices or hijacked by unauthorized users.

You can use hardware-backed certificates for:

• EAP-TLS and other WPA2 Enterprise wireless authentication
• Managed or secured VPN configurations
• Any time you use Import and bind in the Manage certificates section of Chrome’s settings

Some ChromeOS Flex functionalities—such as encryption of user, device, and some system data—optionally use TPM on devices that have an active and supported TPM chipset. For devices that don’t have supported TPM hardware, features continue to function as expected, and are handled by software instead of hardware. For information about how ChromeOS Flex uses TPM, see the Chromium design documentation.

Manage TPM

Before you install ChromeOS Flex on devices, you might need to use the BIOS or UEFI settings menu to make sure that the TPM is cleared, visible, and active.

Clear and activate TPM

1. Boot the device to the BIOS or UEFI settings menu. If you’re unsure which key to use, see Boot keys below.
2. Find the TPM settings. You’ll find them in Security, Device Configuration, or Advanced Settings.
   Note: The option name differs, depending on the OEM. For example, on HP devices, you’ll see Embedded security device.
   1. If you do not see any TPM settings, try setting an administrator password.
   2. Save, exit, and try again.
3. Clear the TPM so that it is no longer owned and has no data from previous use.
   1. Click the option to clear or reset TPM. If the option is visible but unavailable, your TPM is already clear. Go to step 4.
      Note: The option name differs, depending on the OEM. For example, on HP devices, click Reset to factory defaults.
   2. Save changes.
   3. Exit the BIOS or UEFI settings.
   4. Restart the device and boot to the BIOS or UEFI settings menu.
   5. Complete any on-screen prompts that you see to confirm that you want to clear the TPM.
4. Turn on TPM.
   1. In the BIOS or UEFI settings menu, find the TPM settings. Same as step 2 above.
   2. Make sure the TPM settings are set to visible, active, ;or enabled.
5. Check to make sure that settings that might affect TPM status are correctly configured.
6. Save changes.
7. Exit the BIOS or UEFI settings.

Now that you have cleared the TPM and TPM status is Active, you can proceed with installing ChromeOS Flex on the device. Be sure to check the certified models list for specific ChromeOS Flex installation notes or other BIOS tweaks.

Clear TPM using powerwash

You can clear a device's TPM using powerwash as long as you turn on the correct BIOS settings. This is useful when a device is powerwashed as part of a support or device reallocation process.

Note: Powerwashing a device clears the device enrollment, so you need to re-enroll the device afterwards. To reset most devices, we recommend using Clear User Profiles instead of a full Factory Reset.

To clear the TPM using powerwash, refer to your manufacturers’ guidance on setting up your TPM’s Physical Presence Interface. This enables the OS to cooperate with the BIOS and pass control of TPM actions to the installed OS. For more details, see this article.

Check TPM information—Admin console

1. Sign in to your Google Admin console.

   Sign in using your administrator account (does not end in @gmail.com).

2. From the Admin console Home page, go to  Menu  DevicesChromeDevices.
3. To apply the setting to all devices, leave the top organizational unit selected. Otherwise, select a child organizational unit.
4. Find and click the device you want to view TPM information for.
5. View whether ChromeOS Flex supports and owns the device’s TPM. If TPM owned and TPM allowlisted are set to True, ChromeOS Flex is actively using it.

Check TPM status and state—BIOS or UEFI

Deactivate TPM

If you don't want a ChromeOS Flex device to use your device’s TPM chip, you should deactivate the TPM.

1. Boot the device to the BIOS or UEFI settings menu. If you’re unsure which key to use, see Boot keys below.
2. Find the TPM settings. You’ll find them in Security, Device Configuration, or Advanced Settings.
   Note: The option name differs, depending on the OEM. For example, on HP devices, you’ll see Embedded security device.
3. Deactivate the TPM.
4. Save changes.
5. Exit the BIOS or UEFI settings.

Boot keys

Known TPM errors

Related topics

• Trusted Computing Group documentation
• Certified models list

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