UEFI can be just as closed as custom non-UEFI bootloaders. Windows Mobile devices were UEFI, but they had Secure Boot enabled making it almost impossible to boo

UEFI can be just as closed as custom non-UEFI bootloaders. Windows Mobile devices were UEFI, but they had Secure Boot enabled making it almost impossible to boot non-OEM signed images. (Un)fortunately, their Golden Key was leaked allowing experimentation with some Windows Mobile devices [1]. [1] https://www.xda-developers.com/microsofts-debug-mode-flaw-and-golden-key-leak-allows-disabling-of-secure-boot/ https://www.xda-developers.com/microsofts-debug-mode-flaw-an...