I’m struggling with the path please help trying to change boot image
What device do you have? Not all devices utilize a custom oem boot image the same way. Some use a uefi setting and it's a bit difficult to change.
If it's the final boot screen an image file is usually located in the c:\windows\system32 folder and named whatever the OEM named it. In the registry editor does the key and value already exist? I think it should be
HKLM\System\Shell\OEM\BootScreens\WPhoneBootScreenOverride
String Value: [AfilePathandFilename?]
If you want to try the file in your documents folder put
C:\Data\Users\Public\Documents\[FileName.whatever]
Edit: sorry corrected the value path above...