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Windows 7: How to change boot animation in Windows 7

01 Jun 2011   #801
thaimin

Windows 7 Pro 64 / 7 Pro 64 / 7 Home Prem 64
 
 

@RBCC
No method of integrating a modified bootscreen into an install disk works.

@AlexCeed
As claysoft65 said, you can set the animation to something like a pure black screen. If you use my program, you can set it to a 1px by 1px transparent image. Since the animation is compressed, and solid color images compress much better than complicated images, using a solid color animation will greatly reduce it's size. The normal bootres.dll is like 2.5MB if I remember correctly. Using a solid color animation should reduce that to at most a few hundred kilobytes.


My System SpecsSystem Spec
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02 Jun 2011   #802
RBCC

Windows 7 Ultimate
 
 

Is modifying a file and copying a file back into the image integration? I tried tried it once as part of of the install.wim file and it didn't work. John
My System SpecsSystem Spec
13 Jun 2011   #803
RBCC

Windows 7 Ultimate
 
 

I tried it by copying them to the ISO and it didn't work. If I can figure out if I were to replace the files with the $OEM$ Folders and if that will work! Then I will let you know. I got a email from Thaimin and he said it has to do with security measures in Windows 7. John
My System SpecsSystem Spec
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21 Jun 2011   #804
AlexYM

Windows 7 Ultimate x32
 
 

Some bad news here: looks like bootmgr from Windows 8 build 6.2.7989 uses another internal compression, at least thaimin's bmzip utility appears to be "frustrated" by it's compressed part...


bootmgr7989.zip
My System SpecsSystem Spec
21 Jun 2011   #805
thaimin

Windows 7 Pro 64 / 7 Pro 64 / 7 Home Prem 64
 
 

@AlexYM
I just looked into it, and yes, it is very different. I can't even find the proper "MZ" for the compressed program. I assume the compressed part starts at the offset #88B0, but there is no "MZ" near there, so it is not at all the same type of compression. It looks like it uses a static dictionary instead of (or in addition to) a dynamic dictionary like the previous version did.

It is likely that they are reusing one of their other compression technologies. I will check out if it uses one of the WIM compression formats (LZX or XPRESS). I have already written decompressors for those. Both use a static dictionary.
My System SpecsSystem Spec
22 Jun 2011   #806
RBCC

Windows 7 Ultimate
 
 

I was using index 2! John
My System SpecsSystem Spec
18 Jul 2011   #807
thaimin

Windows 7 Pro 64 / 7 Pro 64 / 7 Home Prem 64
 
 

@AlexYM
I finally had some time and looked at the compression in Windows 8 bootmgr. It is compressed with "XPRESS" used in the WIM format. That compression is described at http://msdn.microsoft.com/en-us/library/dd644740(PROT.13).aspx however they only really describe decompression and not how to compress, although I think I can eventually come up with something after studying the algorithm. Additionally the psuedo-code they provide is quite slow so I need to come up with a faster system. One other road-block at the moment is determining the decompressed size before decompression starts. In the WIM format this is supplied for you, but I don't know where it is in the bootmgr file (yet).

My System SpecsSystem Spec
23 Jul 2011   #808
AlexYM

Windows 7 Ultimate x32
 
 

@thaimin
That's very interesting, chances are they won't change compession method in later builds again. If this can be of any help, uncompressed bootmgr.exe can be located as usual inside winre.wim in PXE subfolder and it's size is 564104 bytes for build 7989, i think it should be coded in bootmgr's stub as reversed hex 88 9b 08, so i just looked there purely empirically it maybe right at stub's end - at offset 68a8.





My System SpecsSystem Spec
24 Jul 2011   #809
selyb

Windows 7 x64
 
 

Ok, thanks to this post
Quote   Quote: Originally Posted by joakim View Post
Just sharing my first windbg script ever...
I finally found the values. ntoskrnl.exe from my Win7 x64 has
Code:
C7 42 04 9C 01 00 00 C7 42 08 1C 01 00 00
instead of
Code:
C7 46 04 9C 01 00 00 C7 46 08 1C 01 00 00
I want to modify the animation position. Can I hex ntoskrnl.exe or do I have to use IDA?

@thaimin: what method does your program use to allow the modified files?
What I really need to know is after I use Win7BootUpdater, then modify ntoskrnl.exe, what do I need to do to allow the modified ntoskrnl ?
My System SpecsSystem Spec
25 Jul 2011   #810
speedgamer01

Windows 7 Ultimate 64 bit SP1
 
 

Why don't you all use the software for this job? It's very reliable and has restore functions, you can determine the files manually if you want.
Coder for Life - Project - Windows 7 Boot Updater
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 How to change boot animation in Windows 7




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