1809 PBLUx64 bit stuck at Black screen on ThinkPad X1 Carbon G7 and Yoga G4

Summary: ThinkPad X1 Carbon G7 and Yoga G4 are not booting when PBLU and PBLUx64 is enabled in Profile

Environment Info:

Platform	BIOS	SecureDoc Version	Bootloader Type	Encryption Type	After PBA Install	After Encryption Complete
Lenovo X1 Carbon 7	1.10	8.3 SR1	PBLU	SWE	Loads into Windows	PBLU Boots on Power On
Lenovo X1 Carbon 7	1.11	8.3 SR1	PBLU	SWE	Loads into Windows	Black Screen after BIOS splash on Power On
Lenovo X1 Yoga 4	1.06	8.3 SR1	PBLU	SWE	Loads into Windows	PBLU Boots on Power On

Version affected: SecureDoc 8.3 SR1

Issue:
SecureDoc PreBoot screen is not displayed and stuck at Black Screen

Root Cause: After BIOS upgrade Phoenix SCT (Secure Core Tiano) components is upgrade from working 4.1.0.355 to 4.1.0.370 that breaks Linux function. Further testing was done by Lenovo with SCT version 4.1.0.385 which works with Linux and PBLU but that BIOS is not available to public yet.

Workaround: During boot up clients can tap letter 'a' to change to PBU preboot. Then once in Windows set the profile to PBU or downgrade BIOS on devices. Lenovo is also working on newer BIOS version as it affects other Linux installs

Lenovo has Released Updated BIOS to Fix Linux issue

Download - https://download.lenovo.com/pccbbs/mobiles/n2huj10w.exe
ReadMe - https://download.lenovo.com/pccbbs/mobiles/n2hul10w.txt