New logo for Phoenix BIOS (Intel Atom E3845)

[jencha]

Good day.
Please, help me to replace Logo.
BIOS and new wallpaper: https://drive.google.com/drive/folders/1...sp=sharing
Board: Kontron COMe-mBT10
I have tried to use PhoenixTool and UEFITool.
PhoenixTool found logo only in Padding_1476.ROM.
I tried insert my wallpaper with HEX-editor, but I received only black screen.
UEFITool found EVSA entry "SplashLogoPackage".
I think, I have to replace its body header, but I don't know, What I should write.
Body header:
3566 - size
00060C0000000000000018 - constant part of all version BIOSes
E816 - important part (may be checksum)
0000 - constant part
Maybe Someone knows, What does Important part mean?

[genius239]

Hi~
You said you got a blackscreen after you flashing your mod.
Some questions ,the blackscreen is only during boot logo but it can boot normal and going to os? or it's look like a bios bricked?? ,because i saw some word about rsa signed.

[jencha]

Hi~
You said you got a blackscreen after you flashing your mod.
Some questions ,the blackscreen is only during boot logo but it can boot normal and going to os? or it's look like a bios bricked?? ,because i saw some word about rsa signed.

Blackscreen is only during boot logo. Device boots normal.

[genius239]

edit
==========
sorry ,I think it need to check again , i don't find where the checksum is.
Question !if you transform your logo from jpeg to gif and inject it then change file size in hex then re-flash ,does it black screen still??


=============
Here is i tried to inject new logo into you provided bios ,you could check it at first.
https://katfile.com/n4zawvutuwb9/MVV1R316_1.bin.html

[jencha]

edit
==========
sorry ,I think it need to check again , i don't find where the checksum is.
Question !if you transform your logo from jpeg to gif and inject it then change file size in hex then re-flash ,does it black screen still??


=============
Here is i tried to inject new logo into you provided bios ,you could check it at first.
https://katfile.com/n4zawvutuwb9/MVV1R316_1.bin.html

Thank you. But...There is only black screen, no booting.
BIOS stopped at code 00.

[genius239]

so , i think it contain a rsa signed but you said that you can re-flash and normally boot ,i'm very curious.

tip: E816 is not checksum is png file's file size.
So ,do you have checked my mod at first?

edit
===========
Sorry ,it should gif file not a png file.
What's code00 mean in this machine? maybe you could try do clear cmos.

[jencha]

so , i think it contain a rsa signed but you said that you can re-flash and normally boot ,i'm very curious.

tip: E816 is not checksum is png file's file size.
So ,do you have checked my mod at first?

I checked with gif file, sorry. I added TTS-1024Grey-1.gif to drive.google.
I added kontron.gif also for comparing.

E816 doesn't match with gif's size. Do I have to convert inserted gif file to png?

[jencha]

I don't know, what code 00 mean. I have reserve memory for BIOS, so I can reflash it.

[genius239]

E816 need reverse then get real size of gif file ,so it real size is 16e8.
https://images2.imgbox.com/67/af/elQkCgMr_o.gif

Yiu also can extract other gif file from that module ,head start at 4749463839 then end at 003B.

[jencha]

It's my mistake. I supposed, that there is only 1 gif in Padding_1476.rom
I replaced logo succesfully.

Genius239, many thanks for your very important tip!