Switch Kernel Mac

To select the 64-bit kernel for the current startup disk, perform the following:

Open Macintosh HD > Applications > Utilities > Terminal

In the window that opens, type the following, then press Enter

sudo systemsetup -setkernelbootarchitecture x86_64

Restart your computer.

To select the 32-bit kernel for the current startup disk, perform the following: 

Open Macintosh HD > Applications > Utilities > Terminal

In the window that opens, type the following, then press Enter

sudo systemsetup -setkernelbootarchitecture i386

Restart your computer.

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