====== Information ======

  * Dell Latitude 5591

====== BIOS Settings ======

  * [[devices;dell_latitude_5591_spinesnap|fwupdmgr + cctk]]

====== setup_var Mods ======

  * [[bios:setup_var_mods:dell_latitude_5591_1.35.0|1.35.0]]

====== EFI Variables Dump ======

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

===== CSME System Tools =====

  * 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''

==== BIOS Dump ====

  * 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

===== UEFITool =====

  * https://github.com/LongSoft/UEFITool/releases
  * :!: ''UEFITool'' and not Extract/etc

  * 2024/08/23: ''UEFITool_NE_A68_win64.zip''

==== Dump ====

  * 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''

===== IFRExtractor RS =====

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

  * 2024/08/23: ''ifrextractor_v1.5.1_Windows.zip''

==== IFR Extract ====

  * 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

===== EFI Variables =====

  * 2024/11/17: [[bios;ifr_dumps;dell_latitude_5591_1.35.0|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"

====== BIOS Downgrade ======

  * https://github.com/vuquangtrong/Dell-PFS-BIOS-Assembler
  * ''1.39.0'' (17 Jun 2025) -> ''1.1.6'' (21 May 2018) ((:?: Apparently there's a ''1.0.1'' version: [[https://dl.dell.com/FOLDER04986509M/1/Latitude_5X91_Precision_3530_1.1.6.txt|Latitude_5X91_Precision_3530_1.1.6.txt]]))

  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'

====== Findings ======

===== Linux =====

  * Windows OSI above 2013 causes backlight keys to not work ((laptop MFG is 2019, BIOS 2018, BIOS notes claim certified Win10; interestingly 2013 works best on Linux :p))
  * 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]