Downgrading MacBook Pro 16” to Mojave

Question

Did anyone succeed in installing Mojave on the MacBook Pro 16”? It ships with Catalina but my corporate requires Mojave to connect to the corporate network.

I followed the instructions here but once I select booting from the Mojave external drive I get a “forbidden” icon and the system shuts down.

Answer 1

No. This won’t work since the drivers to run this hardware only ship with Catalina.

If your support team isn’t ready for Catalina have them get you VMware fusion so you can run the older OS virtually while they contemplate supporting the new os.

Answer 2

I just spent a chunk of time with Apple support; they said it's impossible to install Mojave on the 16". Sigh.

Also this: "No macOS Mojave on MacBook Pro 16" from gottabemobile.com

Answer 3

Likely Possible. I partitioned the drive got the Mojave install on and it booted in Mojave but then wanted to confirm startup disk I selected Mojave and eventually also gave the forbidden icon. So it boots but Apple mark it as incorrect at the final part of the load. These chipsets were used in previous MacBook. So maybe using Hackintosh tools we can get past this part.

People saying use VM ignore that there are many high end apps like Soundgrid in Music that will take too much performance hit running in a virtual machine. Apple are mad forcing use to use a new OS until the software is ready.

Answer 4

I have tried without success. I believe Mojave doesn't have the necessary drivers. You can indeed downgrade if you have an older MAC. First, you will need to revert the File System changes though. Catalina creates a volume with 2 disks Macintosh HD and Macintosh HD data.

Start recovery mode (Command+R), open Disk Utility, select the disk and then Delete the volume. Good luck!