Hi, I tried downgrading from ventura to big sur and followed the steps written here
Create a bootable installer for macOS - Apple Support
I get stuck when choosing the OS installation disk and it writes "macintosh hd cannot be downgraded". How can I solve it? Thanks.
MacBook Pro 16″, macOS 11.7
Once booted to the USB installer, you will need to erase the drive by using the instructions in this Apple article:
Use Disk Utility to erase a Mac with Apple silicon - Apple Support
Those instructions are assuming you are using Recovery Mode, but just skip down to the section for Disk Utility since you are booted from a macOS USB installer instead of Recovery Mode. The interface is the same at that point.
Make sure to have a good backup of your files before erasing the drive since erasing the drive will destroy all data on that drive which is not backed up.
Once booted to the USB installer, you will need to erase the drive by using the instructions in this Apple article:
Use Disk Utility to erase a Mac with Apple silicon - Apple Support
Those instructions are assuming you are using Recovery Mode, but just skip down to the section for Disk Utility since you are booted from a macOS USB installer instead of Recovery Mode. The interface is the same at that point.
Make sure to have a good backup of your files before erasing the drive since erasing the drive will destroy all data on that drive which is not backed up.
macintosh hd cannot be downgraded
