I can't boot into macOS Mojave on a Catalina laptop

macbook-pro catalina boot external-disk mojave

Solution 1:

You usually can't boot a Mac with an OS version which is older than the release date of the hardware. The old OS lacks some drivers required for new hardware.

You can still run Mojave etc. within a VM (using VMWare or Parallels).

Related

What is the host "xp.apple.com" for and what is sent there?
how to install ubuntu and triple boot with high sierra and legacy booting win10 with dual disk drive?
Make Time Machine use two drives from Terminal
How to change terminal folder font color
Computer freezes after update 2020-002 on High Sierra. How to revert / cancel update?
How do I get Apache to use the default pyenv Python version instead of the system one?
How do I move my System files to another drive without reformatting the destination?
How can I make it as easy as possible for someone to make an emergency call?
What are the default settings for "Remote Management" under Sharing System Preference pane in macOS?
Mount a network (netatalk) AFP volume using a public key instead of an SSH login password?
leap year determination
27" iMac with mini display port and Windows 10 - use in target display mode?