Trying to make a Sierra installer disk while running Big Sur

DiogoMor wrote:

I've tried that, and I can't get a copy. It always says my Mac (the new one, running Big Sur) isn't compatible with that macOS version.

Then your hands are tied, If you could not download from the backup server I linked to above:

https://support.apple.com/en-gb/HT211683

Try from your 2011 Internet Recovery and use the Disl Utility there to format the new drive and install the macOS

Boot into Internet Recovery (Option Command R) and from the dropdown menu: Utilities>  Disk Utility

Recovery: https://support.apple.com/en-us/HT204904

DiogoMor wrote:

Hello all! I'm trying to refurbish a 2011 MacBook Pro that has a blocked HD due to me screwing up the formatting bit. I need to format it but the HD is configured as the System install disk. I'm trying to create an installer disk to run USB. On my new Macbook, I'm currently running Big Sur and can't seem to get the install files in order to make the USB drive installer in order to fix the old Mac.

Can anyone help???

older macOS installer backups on this server:

https://support.apple.com/en-gb/HT211683

verify you are using the Safari browser to download/initiate the macOS links

Hi,

How to create a bootable installer for macOS - Apple Support

DiogoMor wrote:

Finally did it! Thanks for the help!

Good computing DiogoMor !