• Dell Latitude 5591

• fwupdmgr + cctk

• 1.35.0

• https://github.com/BoringBoredom/UEFI-Editor/blob/master/README.md#how-to-change-hidden-settings-without-flashing-a-modded-bios

• https://winraid.level1techs.com/t/intel-converged-security-management-engine-drivers-firmware-and-tools-2-15/30719
• https://mega.nz/folder/qdVAyDSB#FLCPaDVIsPYiy2TAUjD7RQ

• 2024/08/23: CSME System Tools v12 r38.rar

• Expects CSME System Tools v12 r38.rar extracted to %UserProfile%\Downloads\CSME System Tools v12 r38\

CD "%UserProfile%\Downloads\CSME System Tools v12 r38\Flash Programming Tool\WIN64" && "FPTW64.exe" -d "BIOS-dump.bin" -BIOS

• https://github.com/LongSoft/UEFITool/releases
• UEFITool and not Extract/etc

• 2024/08/23: UEFITool_NE_A68_win64.zip

• Ctrl + O

"%UserProfile%\Downloads\CSME System Tools v12 r38\Flash Programming Tool\WIN64\BIOS-dump.bin"

• Ctrl + F → Text

Overclocking Lock

• Extract PE32 image section with Extract as-is (Ctrl + E)
• Creates Section_PE32_image_Setup.sct

• https://github.com/LongSoft/IFRExtractor-RS/releases

• 2024/08/23: ifrextractor_v1.5.1_Windows.zip

• Drag Section_PE32_image_Setup.sct onto ifrextractor.exe
• Section_PE32_image_Setup.sct.0.0.en-US.ifr.txt is created wherever the original .sct is

• 2024/11/17: BIOS 1.35.0

"%UserProfile%\Downloads\CSME System Tools v12 r38\Flash Programming Tool\WIN64\Section_PE32_image_Setup.sct.0.0.en-US.ifr.txt"

• https://github.com/vuquangtrong/Dell-PFS-BIOS-Assembler
• 1.39.0 (17 Jun 2025) → 1.1.6 (21 May 2018) ¹⁾

cd ~ && mkdir -p ~/'Projects/Dell-PFS-BIOS-Assembler/bios' && rm -Rf ~/'Projects/Dell-PFS-BIOS-Assembler/src' && git clone --branch 'master' --depth '1' --recurse-submodules 'https://github.com/vuquangtrong/Dell-PFS-BIOS-Assembler.git' ~/'Projects/Dell-PFS-BIOS-Assembler/src'

• 1.39.0 Download

wget -O ~/'Projects/Dell-PFS-BIOS-Assembler/bios/Latitude_5X91_Precision_3530_1.39.0.exe' 'https://dl.dell.com/FOLDER12969627M/1/Latitude_5X91_Precision_3530_1.39.0.exe' --user-agent='command'

• 1.39.0 Extract

rm -Rf ~/'Projects/Dell-PFS-BIOS-Assembler/bios/Latitude_5X91_Precision_3530_1.39.0.exe_extracted' && python3 ~/'Projects/Dell-PFS-BIOS-Assembler/src/Dell_PFS_Extract.py' --disassemble ~/'Projects/Dell-PFS-BIOS-Assembler/bios/Latitude_5X91_Precision_3530_1.39.0.exe'

• 1.1.6 Download

wget -O ~/'Projects/Dell-PFS-BIOS-Assembler/bios/Latitude_5X91_Precision_3530_1.1.6.exe' 'https://dl.dell.com/FOLDER04986510M/1/Latitude_5X91_Precision_3530_1.1.6.exe' --user-agent='command'

• 1.1.6 Extract

rm -Rf ~/'Projects/Dell-PFS-BIOS-Assembler/bios/Latitude_5X91_Precision_3530_1.1.6.exe_extracted' && python3 ~/'Projects/Dell-PFS-BIOS-Assembler/src/Dell_PFS_Extract.py' --disassemble ~/'Projects/Dell-PFS-BIOS-Assembler/bios/Latitude_5X91_Precision_3530_1.1.6.exe'

• Mod 1.1.6 (1.39.0 identifiers)

rm -fv ~/'Projects/Dell-PFS-BIOS-Assembler/bios/Latitude_5X91_Precision_3530_1.1.6.exe_extracted/entries/Model Information-1.1.6.bin' ~/'Projects/Dell-PFS-BIOS-Assembler/bios/Latitude_5X91_Precision_3530_1.1.6.exe_extracted/entries/PFS Information-1.1.6.bin'

cp -fv ~/'Projects/Dell-PFS-BIOS-Assembler/bios/Latitude_5X91_Precision_3530_1.39.0.exe_extracted/entries/Model Information-1.39.0.bin' ~/'Projects/Dell-PFS-BIOS-Assembler/bios/Latitude_5X91_Precision_3530_1.39.0.exe_extracted/entries/PFS Information-1.39.0.bin' ~/'Projects/Dell-PFS-BIOS-Assembler/bios/Latitude_5X91_Precision_3530_1.1.6.exe_extracted/entries'

python3 ~/'Projects/Dell-PFS-BIOS-Assembler/src/Dell_PFS_Assembler.py' --folder ~/'Projects/Dell-PFS-BIOS-Assembler/bios/Latitude_5X91_Precision_3530_1.1.6.exe_extracted/entries'

• USB recovery-flash modded ~/Downloads/BIOS_IMG.rcv

mv -fv ~/'Projects/Dell-PFS-BIOS-Assembler/bios/Latitude_5X91_Precision_3530_1.1.6.exe_extracted/entries/__output.exe' ~/'Downloads/BIOS_IMG.rcv'

• F12-boot flash official BIOS (fix identifier), then USB recovery-flash official ~/Downloads/BIOS_IMG.rcv and reset BIOS options

wget -O ~/'Downloads/BIOS_IMG.rcv' 'https://dl.dell.com/FOLDER04986510M/1/Latitude_5X91_Precision_3530_1.1.6.exe' --user-agent='command' && sha256sum ~/'Downloads/BIOS_IMG.rcv' | grep 'f5b920de2682eab67704e93951427c9ca3498ba890176841f969f7fb02f5376d'

• Windows OSI above 2013 causes backlight keys to not work ²⁾
• Linux OSI causes a typec error in dmesg seemingly only with old 1.1.6 BIOS (Win2013 OSI fine)

• pci_aspm=off disables:

[    0.208891] [      T1] acpi PNP0A08:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI EDR HPX-Type3]

• Pretty sure above line included AER on new 1.39.0 BIOS, but not old 1.1.6

[    0.210563] [      T1] acpi PNP0A08:00: _OSC: platform does not support [AER]