Date and time corrected via the date command on terminal - no change. Internet absolutely fine, so is wifi but tried network cable - same thing. Had a 2011 imac 21.5 that needed reinstallation. I hope this guide will help those who were stuck like me at reinstalling high sierra on a mac with a blank SSD in it. This issue of not being able to install a new High Sierra installation to an iMac without its original HDD to a blank SSD had me troutbled for a few days to solve it. Pro-tip: if your fans are constantly at 100%, google the neat programm 'SSD fan control' Then i unplugged the connection and started my installation. My mac was plugged into a working internet connection until the final installer appeared. start the installation by clicking the Install button if your boot-usb drive is not showing with only the internet recovery button, unplug the usb drive and replug it.ġ1. boot your to be installed mac with the ALT-key to list boot optionsġ0. issue the following command: 'high_sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume'ĩ. cd into your folder where you've unziped and renamed the high_sierra.app fileħ. Open a terminal and issue a allevated root session with: sudo -iĦ. Reformat a USB-drive (with atleast 8GB of space) to macos journal with GUID-Parttable and rename it to 'MyVolume'Ĥ. app to something simple like: 'high_sierra'ģ. Unzip the file - rename the unziped installer. What helped was the following (only doable with a working Intel Mac - for me it was a MBP 2018 with Ventura)ġ. Since Apple apparently killed the recovery servers for High Sierra (in europe). For older machines, you will need to Google how to make an external USB installer for your older OS. If this doesn't work, please tell us where you are getting hung up, and that will give us more of an idea of what's going wonky.ĮDIT: This will only work if you have a machine that is 2012 or newer. When the recovery screen comes up, select Disk Utility, go to the top taskbar, select View, select 'view all devices'.ĥ.Select the root of your drive and erase it. It's better to plug directly into the modem if you have an ethernet adapter. Connect to a good wi-fi signal, this isn't something you can do with shaky wi-fi. Again, that's Command-OPTION-r, not just command-r. Here’s step by step on using internet recovery to re-install your OS:ġ. Power off, unplug all peripherals except charger. You need to use command-OPTION -r to install the latest OS that the machine will take. Command-R is the option to install the OS that originally came with the machine.
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