Dell Precision 7530 LA-F591P,
was on latest Bios 1.42 downgraded to 1.29.1 (with ME Region from 1.42).
Is a downgrade to 1.26 possible with the same ME Region (want to use patched upgrade file) ?

On my Precision 7530 a Dell Tpm firmwareupdate:

DELLTPM_NPCT750_7.2.2.0_64_v4.exe

changed the bios/EFI settings persistent to dTpm, but the notebook has only a ptt Tpm – now it fails to boot, only with F12 it can boot.

Please: I would need the files or the hexdump of the files, from a working 7530 or 7730.

The 7530 or 7730 should have a Tpm active and better without vPro and only with ptt Tpm (Device is acpi MSFT0101, should be nearly in all 7530/7730).

Under linux you can copy under /sys/firmware/efi/efivars the files:
...