TPM chip - clearing without knowing the BIOS pw
Posted on 2015-01-28
Read the description carefully: we have a Dell laptop with the bios setup being locked. We found that out while trying to clear the TPM chip of the device using TPM.msc under windows. Windows told us to reboot but upon rebooting, it at once asked us to enter the bios pw in order to complete the process...which we don't have anymore.
So we talked to Dell and they said they can send us a master password if we show them the invoice together with the system serial and passport copy, which we did. We received the master password but in order to use it, we would need to enter the bios - which we can't because of the attempt to clear the TPM! A vicious circle.
Again: the master password can only be used to reset the real password, but we cannot get to the stage where the reset can be initiated because that damn TPM asks for the bios password, blocking all access to the bios!
Question, finally: is it possible to undo initiation of the TPM clearance? In other words: what happens when we choose to clear the tpm, where is that request saved to - directly to the TPM?
We have phoned Dell and they understand the situation but have no further advice because they don't know what is triggering that pw prompt. They are trying to help and contact internal experts, but that might take time, that's why I ask here in the meanwhile.