Apple Resources - Startup Options
http://edu-observatory.org/olli/Apple_Resources/Startup.html



RECOVERY ON MACS WITH APPLE SILICON

macOS User Guide
Use macOS Recovery on a Mac with Apple silicon
  https://support.apple.com/guide/mac-help/macos-recovery-a-mac-apple-silicon-mchl82829c17/mac   

Recovery Options .............. Power button (long hold)
  


  Diagnostics ................. Hold Command-D
    
  Options icon
    Recovery Main Window
    Apple Menu
    Utilities Menu  
    
  Disk Icon
    Startup Manager ........... Click on Continue
    Startup Disk .............. Hold Option, Click on Continue
    Safe Mode ................. Hold Shift, Click on Continue








RECOVERY ON INTEL-BASED MACS https://eclecticlightdotcom.files.wordpress.com/2021/01/intelmacbootmodes.pdf https://support.apple.com/en-us/HT201255 sam.wormley@gmail.com