How to remove old iOS firmware files from Mac manually? Click on Reinstall macOS (or Reinstall OS X where applicable) to reinstall the operating system that came with your Mac. While the startup disc is waking up, hold down the Command+R keys simultaneously. Step 4: Reinstall a clean Mac operating system.To start, you’ll want to go to the Apple menu on the top left of your screen, whether it’s your MacBook Pro, MacBook Air, iMac or any other Macintosh system. In all cases, the process of checking for a Mac OS X update is the same, and that process naturally leads to where you can actually do the update too.And in case you need to use such file again, you can re-download it just like you did it for the first time. After your device has been updated, you don’t need the file you downloaded and thus you can remove it and free up a significant amount of space on your Mac. IOS software updates are files that you download every time you want to update the software of your iPhone, iPad or iPod via iTunes.
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