UEFI firmware image viewer and editor
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LZMA Backport decompression updates from new_engine May 8, 2018
Tiano Backport decompression updates from new_engine May 8, 2018
UEFIPatch Unify version scheme May 21, 2018
UEFIReplace Unify version scheme May 21, 2018
.appveyor.yml Deploy as prerelease to avoid confusion May 19, 2018
.gitattributes Version 0.2.0 Oct 8, 2013
.gitignore Unify version scheme May 21, 2018
.travis.yml Add Linux x86-64 CI support May 7, 2018
LICENSE.md Create LICENSE.md Aug 11, 2015
README.rst Engine 0.20.1 Feb 6, 2015
basetypes.h Backport decompression updates from new_engine May 8, 2018
descriptor.cpp Big update 0.20.0 Jan 31, 2015
descriptor.h Improve descriptor version handling May 6, 2018
ffs.cpp add FFSv3 support with large files and large sections Dec 11, 2017
ffs.h 0.22.1 multiple FFSv3 support fixes, thanks to @osresearch Dec 11, 2017
ffsengine.cpp More proper solution to #137 Jun 23, 2018
ffsengine.h Attempt to workaround #137 Jun 22, 2018
gbe.h Big update 0.20.0 Jan 31, 2015
guidlineedit.cpp UEFITool 0.19.3 Nov 18, 2014
guidlineedit.h UEFITool 0.19.3 Nov 18, 2014
me.h Big update 0.20.0 Jan 31, 2015
messagelistitem.cpp UEFITool 0.18.4 / UEFIExtract 0.2.2 Jul 24, 2014
messagelistitem.h UEFITool 0.18.4 / UEFIExtract 0.2.2 Jul 24, 2014
peimage.cpp Engine 0.20.1 Feb 6, 2015
peimage.h Engine 0.20.1 Feb 6, 2015
searchdialog.cpp Version 0.19.1 Nov 8, 2014
searchdialog.h UEFITool 0.18.4 / UEFIExtract 0.2.2 Jul 24, 2014
searchdialog.ui Monospace font setting moved to uefitool.cpp Nov 15, 2014
treeitem.cpp More proper solution to #137 Jun 23, 2018
treeitem.h Engine 0.20.6 Jul 5, 2015
treemodel.cpp Engine 0.20.6 Jul 5, 2015
treemodel.h Engine 0.20.6 Jul 5, 2015
types.cpp bugfix Apr 30, 2018
types.h bugfix Apr 30, 2018
uefitool.cpp Unify version scheme May 21, 2018
uefitool.h bugfix Apr 30, 2018
uefitool.icns UEFITool 0.19.3 Nov 18, 2014
uefitool.ico UEFITool 0.19.3 Nov 18, 2014
uefitool.pro Unify version scheme May 21, 2018
uefitool.rc Version 0.2.0 Oct 8, 2013
uefitool.ui bugfix Apr 30, 2018
uefitool_main.cpp UT 0.20.7 Aug 13, 2015
unixbuild.sh Unify version scheme May 21, 2018
version.h Version bump Jun 24, 2018





UEFITool is a cross-platform C++/Qt program for parsing, extracting and modifying UEFI firmware images.
It supports parsing of full BIOS images starting with the flash descriptor or any binary files containing UEFI volumes.
Original development was started here at MDL forums as a cross-platform analog to PhoenixTool's structure mode with some additional features, but the program's engine was proven to be usefull for another projects like UEFIPatch, UBU and OZMTool.


You can either use pre-built binaries for Windows and OSX or build a binary yourself.
To build a binary you need a C++ compiler and an instance of Qt4/Qt5 library for it.
Install both of them, get the sources, generate makefiles using qmake (qmake UEFITool.pro) and use your make command on that generated files (i.e. nmake release, make release and so on).


The program can be started directly without any arguments or supplied with a single argument - a path to the UEFI image file to open after start.

The program window is divided into three panels: Structure, Information and Messages.
Structure of the image is represented as a tree of elements with different names, types and subtypes. If you select an element, Information panel will show the available information about the selected element based on it's type and contents.
Messages panel show all messages from the engine, including structure warnings and search results. Most of messages can be double-clicked to select the element that causes the message.

You can open a menu on each tree element to see what operations are possible for the selected element. This can include various types of Extract, Insert and Replace operations, as well as Remove and Rebuild.
Extract has two variants: Extract as is and Extract body. The difference is that Extract as is extracts the element with it's header (GUID, size, attributes and other structure-related information are located there), and Extract body extracts the element data only.
Replace has the same two variants as Extract with the same meaning.
Insert has the three different variants: Insert before, Insert after and Insert into, which is only available for UEFI volumes and encapsulation sections.
Remove marks an element for removal on image reconstuction.
Rebuild marks an element for rebuilding on image reconstruction. Normally, all elements that aren't marked for rebuild won't be changed at all and if you need to correct some structure error (i.e. invalid data checksum) you must mark an element for rebuild manually. If you change an element all it's parents up to the tree root will be marked for rebuild automatically. If UEFI volume is marked for rebuild all uncompressed PEI files in it will also be marked for rebuild because they must be rebased in the reconstructed image to maintain the executable-in-place constraint.

There is also a search function available from the File menu, you can search all tree elements for a specified hexadecimal pattern (spaces are not counted, dot symbol (.) is used as placeholder for a single hex digit), a specified GUID (rules are the same as for hex except for spaces) and a specified text (either Unicode or ASCII, case sensitive or not). Search results will be added into Messages panel, if anything is found.

After you've finished the modifications, you need to initiate image reconstruction using Save image file command from the File menu. If anything goes wrong on the reconstruction, an error will pop up, otherwise the program will prompt if you need to open the reconstructed file. Don't rush it, because reconstruction process can also generate some usefull messages, which will be lost if you open the reconstructed file immediatelly.

Known issues

  • Some images has non-standard calculation of base address of TE images, so the program can rebase them incorrectly after modifications. Will be solved ASAP.
  • Some images may not work after modification because of no FIT table support implemented yet. It's on my high priority features list, so I hope it will be corrected soon.
  • The program is meant to work with BIOS images, not some vendor-specific BIOS update files, that is why some of that update file either cant be opened at all or return errors on reconstruction. If someone wants to write an unpacker for such crappy files - I will be glad to use it.
  • AMI-specific features like NCBs, ROM_AREA structure and other things like that can't be implemented by me because of the NDA I have.