It's an Phoenix (New Style) Bios so Steven is the expert About It, but there are many ways to do this !
I suggest to use WinUpTp from Original Bios File !!!
Follow this guide :
http://www.giocc.com/custom-bios-splash-...eries.html
Create your Logo.bmp file 16 Colors and 10 KB size then execute as Admin "logo.bat" batch program which will
create Logo.mod file and It will integrate into Bios.rom file !
Look BIOS_LOGO.TXT :
**********************************************************************
* *
* NOTES ON CUSTOM START UP IMAGES *
* ------------------------------- *
* *
* THIS VERSION OF THE FLASH UPDATE PROGRAM GIVES THE OPTION OF *
* REPLACING (OR ELIMINATING) THE DEFAULT "LENOVO" IMAGE THAT IS *
* DISPLAYED DURING SYSTEM START UP. THE USER CAN SUBSTITUTE A *
* 16 COLOR WINDOWS BITMAP (.BMP) TO REPLACE THE DEFAULT IMAGE. *
* *
* 1. LOGO.BAT WILL ONLY WORK IN A MICROSOFT ® OPERATING SYSTEM *
* DOS WINDOW. *
* 2. PREPARE YOUR IMAGE BY NAMING IT 'LOGO.BMP', AND COPY IT. *
* 3. GO TO THE DOS WINDOW. RUN LOGO.BAT TO COMPRESS AND PREPARE *
* THE BITMAP FILE FOR FLASHING. LOGO.MOD IS THE RESULT. *
* 4. UPDATE ACCORDING TO INSTALLATION INSTRUCTIONS *
* *
* AFTER YOU UPDATE THE BIOS ON YOUR SYSTEM, YOUR LOGO WILL *
* APPEAR ON THE STARTUP SCREEN. *
* *
* SOME GUIDELINES FOR THESE IMAGES INCLUDE: *
* *
* 1. THE COMPRESSED IMAGE FILE SIZE LIMITED TO 10KB. *
* 2. SIMPLE DESIGNS (THE IMAGE WILL BE COMPRESSED AND COMPLEX *
* IMAGES DON'T COMPRESS WELL...) *
* 3. AN LENOVO LOGO IS USED BY DEFAULT, BUT A 16 COLOR 640x480 *
* WINDOWS .BMP FILE CAN BE USED INSTEAD. *
* *
**********************************************************************
And Logo.bat :
@echo off
@del logo.mod
@chkbmp logo.bmp
@if ERRORLEVEL 1 GOTO ERROR
@fp logo.scr
@fi logo.scr
@rom2mod BIOS.ROM LOGO.MOD
@del BIOS.ROM
@del BIOS.FFV
@del _BUILD.TMP
@del MODULE.MAP
@goto END
:Error
@echo LOGO.BMP file is not found or is not correct.
:END
It works on Original Bios (signed) so to make a Custom Splash Screen into a Bios Mod, It needs to Flash Original using new Logo Screen
then make a Bios Backup to extract the Logo Module with right setting and at last replace into Modded Bios so You can reflash
the Bios Mod with new Splah Screen replaced !
Or try to replace a LogoXX.BMP file doing Tests . . . (Not easy choice !)
Regards