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Lançado em junho de 2012, modelo A1278. Processador Intel com Turbo Boost, até 512 MB DDR5 de RAM vídeo

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Bootable USB is not recognized after using Transmac

Hi ! i recently formated my Mac book pro 13inch 2012 model and plan to reinstall os x high serria with the help of usb bootable drive , for creating mac os high serria bootable usb drive, I used windows pc to create bootable drive with the help of Transmac ,in that , i done format disk for Mac and restored the disk image by choosen Mac os x high serria )DMG file . After completed Restored i Ejected usb and PLUGGED in to my Macbook and power on by holding option Key ,but USB was not recognized not showing in startup drive .

PLEASE HELP ME WHAT I HAVE TO DO

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Did you press the Option key to get to the Startup Manager?

Mac startup key combinations

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Yes done by holding option key but it's not showing usb drive

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@Rajukumar Reddy - I would suspect the drive was not fully setup. You do need to format the drive with GUID journaled file system (HFS+) and then copy the OS installer to the drive and then convert it to a bootable file.

How to create a bootable macOS High Sierra installer drive

And if you don't have it here the updated Installer file How to upgrade to macOS High Sierra Jump down to Step 4, make sure you click on the Blue URL labeled Get macOS High Sierra to get the installer file, you'll need to unpack it before you install it to the drive.

Here's more on why you need this file Vs any older ones If you've got an old macOS install image, it will probably stop working today

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I have been through the same procedure and now I am sitting with 2 damaged USBs. I think this is a bug, it doesn't work at all for me.

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yes, it is a bug. I destroyed two USBs don't use trans mac save your time and money.

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So i downloaded the sierra.dmg file from apple's website. https://support.apple.com/en-us/HT211683

After that, I have no idea what to do. Inside that dmg file is a InstallOS.pkg, which, if i use belana etcher or transmac simply formats the flash drive appropriately and then copies the InstallOS.pkg to the drive and nothing else.

I have an M1 mac mini and I am unable to download a sierra install to create install media for a older Intel Based MBP.

I was able to download a ventura installer and use the terminal to create a bootable usb. So that worked great. But i need sierra or something older.

Can anyone point me in a direction to unpack this .pkg file via windows or an m1 mac?

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@spicyramentt - First your M1 system can’t use Sierra! Next, TransMac only works on Windows PCs and I haven’t been able get it to create a workable format for a Mac boot disk if that is what you are trying to do.

So what is the goal here? What is the system you are trying install a older macOS onto?

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@Dan have you come up with any solutions for creating bootable macos on a pc?

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