Older computers that have a legacy non-UEFI BIOS will always display the default logo. Since you have a new computer with a UEFI BIOS, the BIOS in conjunction with the OS, displays what you see. To attempt to loosen the restrictions, you need to go into
your UEFI BIOS during bootup. This process varies based on manufacturer and model. On my Dell I can press F2 or F12 then select BIOS Setup. Once there, I select Secure Boot - Secure Boot Enable then uncheck Secure Boot Enable. If you have legacy mode separate,
enable it.
If this does not revert the logo (it actually does not in my latest DELL laptop since a legacy mode does not exist but does on older ones), there is likely no (documented/available) way to revert the computer from displaying the stored DELL BGRT logo in
your DELL UEFI BIOS. The solution to change it requires you to modify your BIOS either using tools provided by DELL (if one is available for your model) or third-party created tools like
HackBGRT [github.com]. Doing so is at your own risk, as either performing the process incorrectly or failures in that software could brick your computer. You may want to reach out to DELL support before you consider this approach.
If replacing it, you can use one of the graphics the OS uses for legacy systems. I extracted them from my machine running Windows 10 2004 and placed a copy here:
Windows10BootLogos.zip \[pcdust.com\]