So i downloaded the sierra.dmg file from apple's website. https://support.apple.com/en-us/HT211683
After that, I have no idea what to do. Inside that dmg file is a InstallOS.pkg, which, if i use belana etcher or transmac simply formats the flash drive appropriately and then copies the InstallOS.pkg to the drive and nothing else.
I have an M1 mac mini and I am unable to download a sierra install to create install media for a older Intel Based MBP.
I was able to download a ventura installer and use the terminal to create a bootable usb. So that worked great. But i need sierra or something older.
Can anyone point me in a direction to unpack this .pkg file via windows or an m1 mac?