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Start the Mac and hold down the option key. This is due to the updated SuperDrive firmware included in either the Install disc or the software updates one has to install to reach the latest version of OS X, namely 10.6.6.Insert the flash drive in a USB port on your Mac.

Once your new disk is installed, do the following. If not, the rest of this guide continues: I don't own the tool or promote it so I won't link it but I do recommend it since it helped me. It will create the bootable USB device for you. If you are not able to do follow the instructions on the link above, or are wary or using command lines, download a free tool called Unibeast onto your Mac. Within OS X Utilities, choose Reinstall OS X. Prepare a clean external drive (at least 10 GB of storage). The following method allows you to download Mac OS X Lion, Mountain Lion, and Mavericks. For this you will need a USBīoth of the above steps are outlined at the Apple web site: " Create a bootable installer for OS". Install older OS X onto an external drive. Download El Capitan (OS X 10.11) from the Mac App Store.

For some older Macs this won't necessarily be the latest OS, such as MacOS Monterey, but instead MacOS Catalina, for example.To avoid having to install OS X twice, do the following.īefore removing your existing hard disk, follow the steps given below: Your computer should then install the latest version of OS that it can install.

Select the startup disk and go to the Erase Tab.Select " Disk Utility" and click on Continue.Turn your Mac on, while holding the CMD + R keys down.Also, it is advised to make a time machine back up of your computer if possible before following the procedure. To reinstall your Mac's OS without an installation disc you need to firstly make sure that you keep your Mac turned on during the whole procedure, and that your Mac is connected to the internet. In this article we will show you how to reinstall Mac OS without disc. MacOS includes a recovery partition that allows you to easily erase all data on your Mac and reinstall your OS without an installation disc.