![]() ![]() in UEFItool right-click the first Raw Section entry -> Replace Body. There seems to be little free space left in the BIOS image, so if the pic you want to use is still too large (over around 130K) make it either a smaller resolution, or use stronger JPEG compression to get the file size down. (I just managed to get a 1920 one to work, see screenshot - file size is the real issue, max around 130KB). This BIOS seems to be limited to max 800圆00 resolution (or so UEFItool said when I tried a larger one). RAW file it writes out is actually a JPG file (you can rename it to view it). ![]() The first (as of 1.72) is the splash screen you want to replace (the 2nd are the BIOS keys) If you like you can right-click it -> Extract Body first. you should now see two Raw section entries: click it to open it, then open the section it reveals. it should find it in the 'Messages' panel below ( GUID Pattern "7BB2."). drop the BIOS file into it (tested with X300 v1.72). versions use a new engine that doesn't seem to support replacing yet) ( at the time of writing only the older 0.28 release allows you to replace sections, the newer A. What did work was replacing the small splash image in the BIOS file with a custom image & reflashing (straight from the BIOS): Even with its debug option enabled, I see nothing different on Post/boot, so I suspect it never actually runs ( I might have missed something). It installs fine (after taking ownership of and messing with permissions of the EFI file it wants to overwrite), but it boots as before.
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