Partition Mojave HD to run Sierra

Started 2 months ago | Discussions thread
JPAlbert Senior Member • Posts: 1,065
Re: Partition Mojave HD to run Sierra
1

OP:

OK, let's try yet another approach.

You said you have a copy of the Sierra installer in your applications folder but it won't launch without an error msg, is this correct?

Do this:
Download a small free app called "Install disk creator".
I think you can get it here:
https://www.macupdate.com/app/mac/55532/install-disk-creator

Next, you will need a USB flashdrive at least 16gb in size. You could try 8gb and see if that works. It might.

Format the flash drive to Mac OS extended with journaling enabled, GUID partition format (HFS+).

Launch install disk creator and follow the instructions. They're easy.

Is it able to create a bootable installer of OS Sierra?

If so, SHUT DOWN, all the way off.

Now, press the power button and hold down the option key continuously until the startup manager appears. Select the flashdrive with the pointer and hit return.

Do you get a good boot from the bootable flashdrive?

If you do, start the OS installer and start clicking through. REMEMBER to "aim it" at the external drive that will become your Sierra boot drive.

Does this work?

One other thing:
DON'T WASTE ANY MONEY getting the 17" repaired, especially if it's suffering from RadeonGate.

You'd really spend that $$$ more wisely on a new Mac.

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