05-25-2014 10:15 AM
I got a very strange problem which I was unable to solve yet:
My ThinkPad Yoga won't work with BitLocker.
After initiation of the "BitLocker system test", it boots to the blue "BitLocker screen" - still, the PIN which was set before is not accepted. After cancellation of the test, Windows 8 (Windows 8.1 Update 1) states that the test failed, because the TPM could not be written.
While doing some troubleshooting, I recognized that BIOS states the TPM being in "MFG Mode" (= manufacturing mode?); this might be caused by a motherboard change done by the Lenovo service approx. 1 month ago.
My question is:
Does anybody know how to make the TPM leave "MFG mode" or any other solution to this problem?
Thanks in advance!
11-30-2015 02:05 AM
I noticed this when I had a Yoga returned from repair, the motherboard has been replaced twice, once to cure the original fault, the second time to try to get the chip out of Mfg Mode.
The person I spoke to at the IBM hardware call centre hadn't come across this before.
The yoga has been decrypted and encrypted again, and totally rebuilt. In both cases the TPM chip seemed to work.
I am trying to work out a way of testing the bitlocker is actually working, i.e. it will ask for a bitlocker key if it detects any interference.
I am slightly worried that we are not able to clear the chip.
Any input from Lenovo/IBM would be appreciated.