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Connect the USB flash drive you want to use to fix your Mac.
If you have any data on the USB, remember to make a backup, as everything on it will be erased. You want to do this before creating the bootable media because there is a good chance that the drive was formatted using a Windows device. On the warning message, click Yes to format the drive.
These instructions will guide you to quickly make a bootable USB installation media for Mac OS X on Windows, this works with Yosemite and. Here are the steps to create a macOS bootable USB media (Sierra) with GPT partition Download and install TransMac on your Windows PC.
Click Yes to confirm. If the formatting completed successfully, click OK to continue. Click the browse button on the right, locate the.
Click Open. Once the process completes, you can now insert the USB flash drive on your Mac computer to install, reinstall, or upgrade the operating system to the latest version of macOS, which can be Sierra or later. In this case, you want to redo the entire process again, but this time use the following steps to use the Diskpart command-line utility on Windows to create the appropriate GPT partition. Type the select disk command followed the number assigned for the USB flash drive e. Once you formatted the USB flash drive to a GPT partition, you can use the instructions mentioned above to use TransMac to create a bootable media, but this time skip the steps 5 through 9 , and continue on step After the process completes, which can take up to an hour, connect the USB flash drive and power on your Mac holding down the Option key, select the USB drive to begin the installation of macOS.
I had this problem with a friend computer, it was an old iMac and I'll tell you it is not going to be easy. The first thing you have to do is make sure what model you have the year when your computer has been released then check on the official apple website to see what is the latest macOS or Mac OS X version available for you computer. In this case, you have to download the dmg file, that can be found on the web, for example, one websites that provides some macOS and Mac OS X is this for El Capitan, if you need another version, I'm sorry but you have to search for it.
Here things start to get a little tricky.
First of all you have to flash the image on a USB drive, I recommend etcher, that works on everything Mac, Linux and Windows too it's extremely easy to use and you just need to select the drive and the image and etcher will do everything by itself, plus it's free here. When the USB drive is ready you can plug it in you mac and press alt option while booting, you have inserted a firmware password, it will ask you to unlock the firmware by inserting that password, else it will take you to all the bootable drives, including your USB device.
If you see the mac logo with a stop icon over it, it means that you downloaded a too new version that is not supported from your mac, else it will start. When it start, it won't install, saying that the system can't verify the downloaded image, that's why you have to navigate on the "utilities" menu on the top bar and open the terminal. That's basically because every image of mac has a certificate that can expire, so, if the certificate is expired you won't be able to make it work, unless you change the date the date is different from mac version to mac version, so based on that you have to change it, usually just search for when was that version released and se the current date to that date or even one or two days later to make it work.
Then try to install the system, if this does not work again, you can start the installation without verifying the image, but you should really trust the image you're using from being corrupted or modified just to make sure the download went right, use the SHA-1 code to make the file has been downloaded right.
So, to proceed without verifying the image, from terminal, type in this command: Is possible that you won't need the sudo at the begin, in that case just remove it from the command and start from "defaults" Now you should be able to install macOS from a USB drive Just a little thing, make sure to have formatted the disk before proceeding, I would recommend to make a partition that takes the whole disk in mac Journaled format, then if you want you will be able to encrypt the disk the installer will ask you to do that later , instead, if the disk was encrypted before, you will have to insert the encryption key of the disk to continue the installation process.
Really hope this help, I spent a lot of hours to do this on a really old iMac from Good luck! You will be able to download a copy of old one version of powerISO by provided links this tutorial. Thank you for your interest in this question. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count. Would you like to answer one of these unanswered questions instead? Home Questions Tags Users Unanswered.
Ask Question. Any help would be greatly appreciated! Thanks for your response. However, the problem differs from the one you linked to since I do not want to run an OS X installation in Windows running in bootcamp on a Mac. What I want to do to is easily achievable using createinstallmedia or Disk Utility.
Now, what you want to do, create a new partition and go ahead. This has been observed on the late Mac Mini but may affect other models as well. Run the follow command and enter the admin password when prompted: You want to do this before creating the bootable media because there is a good chance that the drive was formatted using a Windows device. Rufus won't make a bootable USB compatible with Mac as it cannot interpret the boot loader at least not in Mavericks and up. Open Command Prompt with administrative permissions. Here is my online pictorial notebook.
The question asked is about how to create a bootable Mac installing USB in the windows embitterment.