Dell Latitude E7270/E7470 System BIOS 1.15.4, Bitlocker fails

i have the same  Problem.   E7470 and E5570  with newest Bios.  

with Windows 10 LTSB 2016

I have exactly the same issue. Updated from 1.12.x (not sure) to 1.15.4, to hopefully the TPM issues I encountered. Steps taken before applying the update:

- Suspend bios

- Decrtypt disk drive

- Apply bios update

- Clear TPM after reboot

At this point the TPM module isnt recognized at all anymore in Windows 10. Under the device manager there are no security devices registered. I tried turning TPM off and after a reboot turn it on again but to no avail.

Any news what to do? I dare not risk bricking my motherboard by applying an earlier version.

Please advice.

I have also followed the steps below as suggested in another topic:

1. Power off the laptop and remove any power adapters.
2. Remove the rear cover (screws do not come out fully).
3. Remove the SODIMM(s).
4. Remove the battery (one screw, pull the tab to remove the battery connector from the board).
5. Press and hold the power button for 20 seconds (to drain capacitors).
6. Reinstall the SODIMM(s).
7. Reconnect the battery and screw it down.
8. Attach the rear cover.
9. Power on the laptop, boot into windows, open Device Manager and verify the TPM is listed under Security Devices.

But unfortunately the TPM module still isnt listed as security device.

so i´am testing

E7470  with new Bios and Windows 10  and Legacy BIOS dont work.      UEFI works !!  

www.dell.com/.../resolving-a-problem-enabling-bitlocker-on-a-latitude-exx70-pc-with-windows-10-installed

i make a dell call tomorrow. Sorry Dell but this is not okay.

I downgraded from 1.15.4 to 1.11.3 with success and no more getting BitLocker prompt at boot.

I have everything as you stated and it still does not allow me to enable bitlocker.  TPM 1.2 listed in device manager, BIOS 1.15.4, Legacy enabled, secure boot disabled.  

Secure boot is what it says.  It is extra security to the boot when UEFI is enabled.  Only works with windows 8 or higher

On my laptop it shows TPM 2.0 in the Device Manager. (Note: Before disabling the secure boot option, it didn't show up at all on my machine)

Maybe try to update TPM from 1.2 to 2.0 via the update tool as suggested in this KB article?

I've solved the issue on my E7470 by disabling the secure boot option in the bios. I've also ticked the following boxes in the advanced boot options: Enable legacy option ROMs, Enable attemt legacy boot. Not sure if these are also required, but now the Security Devices and Trusted Platform Module 2.0 are listed again in the Device Manager. Bitlocker is at 99,1% encrypting my C drive, so all seems well again. :) (note still using bios 1.15.4)

I have no clue what I am missing by disabling the secure boot option in the bios? Can anybody elaborate on that?

The same problem here. Got E7270 updated to 1.15.4 everything seemed to be ok, so we got second E7270 updated. After laptops were shut down(restart went with no issues) bitlocker started asking key for every boot.

We rolled BIOS back to 1.10.4.

Curious - you rolled back to 1.10.4, but does 1.11.3 work with Bitlocker?

Actually one was rolled to 1.10.4 and the second to 1.13. Both work with Bitlocker. Just had to activate it in bios after flashing.

I guess Dell won't be coming out with a fix?  Problem for me right now is not being able to enable bitlocker encryption.  When I try to turn on Bitlocker I get "The TPM on this computer does not work with the current BIOS.  Contact the computer manufacturer for BIOS upgrade instructions.

I've tried both current BIOS version and older BIOS version and I still get the same result.

Have you tried this?

1.) Completely disable the TPM chip.

2.) Downgrade the BIOS to v1.12.3

3.) Enable TPM

4.) Reboot

5.) Clear the TPM

6.) Upgrade the TPM to FW v5.81.2.1

If the OS can see see the TPM chip, that's good. Now its just a matter of using the right BIOS

I actually ran into this issue last week on an E7470 with no TPM enabled.  I decrypted after the bios upgrade and re-encrypted but the bitlocker screen comes getting back.  I am certain it is a setting in the 1.15.4 bios and I am very disappointed that Dell does not have a proper write up for this or can produce an update that does not hamper its enterprise users.

Everyone, let us not forget that the point of going to the latest B here is to address AMT vulnerability.  In my case, I would need both the ability to patch this vulnerability AND Bitlocker to be enabled without asking me for code each startup.

Chris,  it has been some time now.  Any news from the engineers?