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I have some systems that I am unable to enable Bitlocker on. The TPM wizard reports that the version of the TPM is inadequate to function with bitlocker.

Is it possible to upgrade a TPM to 1.2?

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Maybe. Check with your vendor to see if there are any firmware updates. Most computers have the TPM module built in, so it's not replaceable/upgradeable, but some do have modules that can be upgraded.

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