Hi fa1053,
For Jetpack 5.1.1, please download the uefi source with branch r35.3.1-updates as following.
$ edkrepo clone nvidia-uefi-r35.3.1-updates NVIDIA-Platforms r35.3.1-updates
You could refer to the following patch to disable the register for hotkey.
--- a/Silicon/NVIDIA/Library/PlatformBootManagerLib/PlatformBm.c
+++ b/Silicon/NVIDIA/Library/PlatformBootManagerLib/PlatformBm.c
@@ -1193,7 +1193,7 @@ PlatformBootManagerBeforeConsole (
//
// Register platform-specific boot options and keyboard shortcuts.
//
- PlatformRegisterOptionsAndKeys ();
+ //PlatformRegisterOptionsAndKeys ();
//
// Register EnrollDefaultKeysApp as a SysPrep Option.
@@ -1546,7 +1546,7 @@ PlatformBootManagerAfterConsole (
//
// Display system and hotkey information after console is ready.
//
- DisplaySystemAndHotkeyInformation ();
+ //DisplaySystemAndHotkeyInformation ();