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JM22681

12 Posts

98130

October 14th, 2014 08:00

Dell Venue Pro 11 5130 and A09 BIOS - BitLocker Recovery Issue

Hi,

I just updated my bios from A08 to A09 on a DVP 11 5130 and my BitLocker now prompts for a recovery key after every cold boot.  Before applying A09 I did suspend protection as I have for each BIOS update however I seem to be stuck in an infinite recovery loop.  Things I've tried:

  • Disconnected travel keyboard
  • Disabled USB Boot in BIOS
  • Ensured sequencing of boot order is correct
  • Unencrypted/Re-encrypted entire drive
  • Unencrypted/Re-encrypted entire drive while inbentween reboots clearing TPM in Windows MMC

It only happens upon cold boot, not upon restarts.  Luckily I have a recovery key printed.  What did A09 introduce to corrupt the BitLocker platform validation?  What else can I try?

JM22681

12 Posts

October 18th, 2014 12:00

Well, I got it working, but it was contrary to that article's guidance.  My BIOS settings when I upgraded from A08 to A09 were set to PTT (with TPM 2.0 integrated), which effectively disables the ability to enable the legacy TPM 1.2.  The only way I've gotten the TPM to work is to actually downgrade it by deselecting PTT in the BIOS, rebooting, and activating the legacy TPM 1.2.  In other words TPM 2.0 with PTT worked for my first 10 months (previous to A09), but the only way I've been able to get it working after A09 was to downgrade.  The one thing I haven't tried is decrypting and going back to PTT after switching to TPM 1.2.

Oh well...at least I'm back up and running!

JM22681

12 Posts

October 14th, 2014 19:00

I tried 2 more things today to no avail:

  • Downgraded to A08 (seemed to let me), unencrypted, re-encrypted.
  • Used the manage-bde command to remove and re-add the TPM key

Is anyone else who's running BitLocker encryption running into this recovery loop?

DELL-Shawn B

3 Apprentice

 • 

540 Posts

October 17th, 2014 14:00

Hi JMC22681,

Thanks for the post! We may have just the guide for you. Check out the solution in our knowledge base document below, it outlines the use of Intels PTT Firmware solution instead of the TPM discrete chip.

 

Venue 11 Pro (5130) encrypted with Windows Bitlocker prompting for a recovery key on boot

http://www.dell.com/support/Article/us/en/19/SLN292585

 

Let us know if it helps!

Thanks,

JM22681

12 Posts

October 17th, 2014 15:00

Thanks, can you help me translate this into a task?  If I am already encrypted should I clear TPM and ensure PTT is enabled in BIOS?  Or should I decrypt first?  How do you uninstall TPM in Windows?

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