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Pull down the “Utilities” menu option and choose “Terminal”, then type the following command into the prompt: To determine if the Terminal date trick can fix those error messages and help you to successfully install MacOS X, you’ll need to turn to the command line while at the “Install Mac OS X” boot menu. If you’re on a computer without internet access, or if you encounter the problem during an alternative OS X installation method and thus can’t access System Preferences, turning to the Terminal to set the date is the next option. That method requires the Mac to have active internet access, however. To do this, go to the  Apple menu > System Preferences > Date & Time, and be sure the “Set date and time automatically” option is checked: If you run into either error message while trying to update or install Mac OS X while from an active OS X boot (say, a standard upgrade from the App Store), you can typically resolve the problem simply by setting the Date & Time on the Mac to be determined automatically. Create Bootable Usb Stick Mac Os X Mountain Lion.Bootable Usb For Mac Os X Mountain Lion 10.7.It’s possible to encounter these errors during basically any type of installation attempt in OS X El Capitan or OS X Yosemite, ranging from the standard App Store update, using Internet Recovery, to clean installs, and using a bootable installer volume on a target Mac. On every OS X 10.8 Mountain Lion there is a hidden partition to enable a method for Mountain Lion OS to be reinstalled on the machine, it is known as the Recovery Partition or drive and is 650mb in size. How to make a Mac OS X Lion bootable Thumb/Flash/USB Drive for free. All you need is a 4GB Flash Drive and the OS X Install package Any questions post below. When done, your USB is ready with the installer. Prepare BIOS: Now take this Bootable USB and plug to the PC where you wish to install it.Power ON system and hit F12 (or whatever shortcut you’ve for your PC to boot into BIOS) and then Enable boot from USB, and raise its priority to the highest. As you want to create a LiveUSB you need a.iso image to make it. The Mac image is a.dmg file, so you must to convert this file into.iso, and then install it. To install open a terminal and enter this command: sudo apt-get install dmg2img Convert the Image.ĭMG2IMG (1, 2) will convert the.dmg image into a.iso image.