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macrumors member
Original poster
Jul 25, 2012
Just as the title says, I need to reinstall macOS Catalina 10.5.3 in a Mac Pro 2013 but would like to know if I do it from a USB boot flash drive but doing it from within the operating system will erase user data, I always prepare USB flash drives with macOS operating systems in order to boot them from and make clean installs but I have never tried do this from within the operating system itself instead of booting the machine then press Alt-Option key to choose the USB flash drive which contains the operating system in order to make a clean install.

Actually there is no user data in the hard drive of the machine so I don't need to make a backup of the data but there is so much software already installed and configured in the machine that I would like to save the effort by not needing to reinstall and configure all that software again in the machine.

I need to reinstall macOS Catalina 10.5.3 again because I was trying to BootCamp the machine with Windows 10 Pro but something happened and it looks like some files containing EFI boot info were damaged, I did some googling and it seems that reinstalling the macOS again can solve this.
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