Nothing has changed in the OS or firmware.  Zap your PRAM and try again.  

If that doesn't work, plug in a USB keyboard and see if maybe the bootloader 
likes the option key on that keyboard better than the built-in one.

> On Apr 7, 2018, at 12:37 PM, Michael <keybou...@gmail.com> wrote:
> 
> I am running 10.9.5, on a 15 inch, mid 2014 MacBook Pro.
> 
> I used to be able to use startup disk in system preferences to select a 10.12 
> USB stick.
> 
> I used to be able to hold down the option key and get a chooser at boot time.
> 
> I even wondered if maybe the bless information had gotten cleared
> 
> bash-3.2# bless --info .
> finderinfo[0]:    606 => Blessed System Folder is 
> /Volumes/Sierra10-12test/System/Library/CoreServices
> finderinfo[1]: 440225 => Blessed System File is 
> /Volumes/Sierra10-12test/System/Library/CoreServices/boot.efi
> finderinfo[2]:      0 => Open-folder linked list empty
> finderinfo[3]:      0 => No alternate OS blessed file/folder
> finderinfo[4]:      0 => Unused field unset
> finderinfo[5]:    606 => OS X blessed folder is 
> /Volumes/Sierra10-12test/System/Library/CoreServices
> 64-bit VSDB volume id:  0xD0753A395E418072
> bash-3.2# cd /
> bash-3.2# bless --info .
> finderinfo[0]: 803839 => Blessed System Folder is /System/Library/CoreServices
> finderinfo[1]: 846201 => Blessed System File is 
> /System/Library/CoreServices/boot.efi
> finderinfo[2]:      0 => Open-folder linked list empty
> finderinfo[3]:      0 => No alternate OS blessed file/folder
> finderinfo[4]:      0 => Unused field unset
> finderinfo[5]: 803839 => OS X blessed folder is /System/Library/CoreServices
> 64-bit VSDB volume id:  0x82BCF4CF22760DAE
> bash-3.2# 
> 
> 
> The bless information on my USB stick looks similar to what I see on my hard 
> drive.
> 
> I used to be able to do this.
> 
> I am no longer able to boot off of a USB stick. I am no longer able to boot 
> from my recovery mode partition.
> 
> Help? How do I make this work, or has Apple done something to the firmware 
> and this will not work at all anymore?
> 
> /Volumes/EFI/EFI/APPLE/FIRMWARE/MBP112_0138_B25_LOCKED.scap has a date of 
> 2017-09-26
> 
> 
> And for completeness,
> bash-3.2# bless --info /Volumes/Recovery\ HD/
> finderinfo[0]:     24 => Blessed System Folder is /Volumes/Recovery 
> HD/com.apple.recovery.boot
> finderinfo[1]:     25 => Blessed System File is /Volumes/Recovery 
> HD/com.apple.recovery.boot/boot.efi
> finderinfo[2]:      0 => Open-folder linked list empty
> finderinfo[3]:     24 => Alternate OS blessed file/folder is 
> /Volumes/Recovery HD/com.apple.recovery.boot
> finderinfo[4]:      0 => Unused field unset
> finderinfo[5]:     24 => OS X blessed folder is /Volumes/Recovery 
> HD/com.apple.recovery.boot
> 64-bit VSDB volume id:  0xE93483E4DDDE9594
> 
> 
> And something I just thought of in case it makes a difference: on the USB 
> stick,
> 
> bash-3.2# bless --info /Volumes/Recovery\ HD/
> finderinfo[0]:     23 => Blessed System Folder is /Volumes/Recovery 
> HD/com.apple.recovery.boot
> finderinfo[1]:     24 => Blessed System File is /Volumes/Recovery 
> HD/com.apple.recovery.boot/boot.efi
> finderinfo[2]:      0 => Open-folder linked list empty
> finderinfo[3]:     23 => Alternate OS blessed file/folder is 
> /Volumes/Recovery HD/com.apple.recovery.boot
> finderinfo[4]:      0 => Unused field unset
> finderinfo[5]:     23 => OS X blessed folder is /Volumes/Recovery 
> HD/com.apple.recovery.boot
> 64-bit VSDB volume id:  0x00D7DD48B1E38F6A
> bash-3.2# ls /Volumes/EFI/
> total 6
> 1 .Spotlight-V100/      1 .Trashes/             4 ._.Trashes*           1 
> .fseventsd/
> 
> 
> ---
> Entertaining minecraft videos
> http://YouTube.com/keybounce
> 
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