OS X: started with a 32-bit or 64-bit Kernel

OS x: 64-bit OS x has been used by default until the computer is started with a 32-bit or 64-bit kernel. I suddenly wanted to use the next 32-bit OS X: the default value is 64-bit until the computer is started with a 32-bit or 64-bit kernel, I checked the Mac OS X v10.6 and later documents on the Apple website, which contain 64-bit kernels. On the hardware that supports the 64-bit kernel, you can use the 64-bit kernel or the earlier 32-bit kernel to start Mac. You can use any of the following methods: OS X: Start with a 32-bit or 64-bit kernel 1: Start the combo key (only available for current startup). If your Mac uses a 32-bit kernel by default, however, the 64-bit kernel is also supported. You can use the 64-bit kernel to start the system by pressing the 6 and 4 keys during the startup process. If your Mac uses a 64-bit kernel by default, you can start it with a 32-bit kernel by pressing the 3 and 2 keys during startup. The Mac will resume using the default kernel at the next restart. Method 2: Set the disk (valid permanently) to select a 64-bit kernel for the current boot disk. Use the following command in the terminal: sudo systemsetup-setkernelbootarchitecture x86_64 to select a 32-bit kernel for the current boot disk, run the following command in the terminal: sudo systemsetup-setkernelbootarchitecture i386 note: this setting is stored in "/resource library/Preferences/SystemConfiguration/com. apple. boot. in the plist file, it takes effect every time it is started from the disk. If you start from another disk, the settings or hardware default settings on the disk take effect.