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In macOS 11.0 recovery Terminal, why does the following fail: nvram BootPickerChoice=%01 Or similarly, why does the following fail: nvram -d BootPickerChoice

bob@machine[~]$ sudo ls -lah /Users/bob/.Trash/ ls: cannot open directory '/Users/bob/.Trash/': Operation not permitted bob@machine[~]$ sudo ls -lah /Users/bob/ | grep Trash drwx------ 2 bob staff 64 Sep 11 20:01 .Trash bob@machine[~]$What am I not understanding about permissions that would result in the behavior shown above?I'm running the latest:bob@machine[~]$ uname -a Darwin machine.local 19.0.0 Darwin Kernel Version 19.0.0: Sun Aug 18 23:37:31 PDT 2019; root:xnu-6153.0.166~17/RELEASE_X86_64 x86_64 i386 Macmini8,1 Darwin bob@machine[~]$