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Tpm on Latitude E5470 locked out
Hi Guys,
It's my first post, i need help with a Latitude E5470, we got it with Windows 7 preinstalled, i load our Windows 10 corporate image on it and encripted using Bitlocker.
The problem is that the user forgot his Bitlocker PIN and locked the TPM, i got to Windows using the recovery key and decrypted the drive succesfully. Now, when i try to encrypt the drive i got the "The tpm on this computer is currently locked out" message.
I already upgraded the BIOS to versión 1.4.7, formatted the drive and loaded OS again, restored BIOS defaults/Factory settings, used PowerShell commands but all with no progression.
Thanks in advice for any help.
ejn63
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April 26th, 2016 14:00
The TPM can be cleared by using the Windows administrative snap-in (start-run-tpm.msc).
Note that doing so will clear not only the TPM keys but everything protected by them.
horyel
2 Posts
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April 28th, 2016 17:00
Thank you for replying, actually i tried it but the "clear" option is greyed out and i cannot select it. Also when i choose the "prepare tpm" option i got a message saying the tpm is locked out.
ejn63
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April 28th, 2016 19:00
You may want to read here:
< >
in particular:
"Too many failed attempts to access the TPM will cause a lockout state for the TPM chip on the motherboard. This is by design of the manufacturer of the TPM.Unlocking the TPM chip requires the machine to be powered on for at least 20 hours continuously. You will need to disable sleep or hibernation in order to allow the continuous time period until the lockout timer expires.The lockout should be less than 24 hours and starts from a few seconds and will grow exponentially depending on the number of access failures.Once the lockout clears, the TPM will be recognized within EMBASSY Security Center."