644      iPhone_iPad_Mac_apple

How to abort a macOS Sierra Installation

Hi Guys,

Here is a challenging one... I wanted to install macOS Sierra, but for some directory and SSD issues, it refuses to install it, it tells me that there are some issues and can't install it and ask me to chose a start disk or restart... I can't chose the SSD macintosh (D:), but I can for the HD Boot Camp Windows 10 (C:), and when I am restarting it launches the macOS Sierra Installation wizard... Anyone knows how to abort the macOS Sierra Installation and how to I go back to macOS El Captain...

Hardware:

MacBook Pro Mid-2012

Intel i7

2,9 Ghz

16 Gb or Ram

2 Drives with 2 different operating systems (running Boot Camp 6)

1. SSD 1Tb running Mac El Captain on Machintosh HD (D:)
2. HDD 750 Gb running Windows 10 Pro on Boot Camp (C:)

N.B.: the HDD with Win10 is located in the original drive location and SSD is located instead of the optical drive in an optical bay SATA HD enclosure.

Running extremely fast and well on the SSD MacOS El Captain (even better then the new Mac Air, MacBook Pro Retina, flash SSD...), but a bit slower on the HDD Win10 but that’s normal…

I have downloaded Mac OS Sierra and started the upgrade to Mac OS Sierra… it starts then stocked and cannot install it… I remember having the same issue with the upgrade from Yosemite to El Captain, brought to a Mac
Genius and sorted it out by swopping the place of the HDD and SSD…

I have tried everything, there is apparently an issue with the directory, severely damaged can’t repair, blablabla… spare you the details I rebooted on the recovery and launched DW (Disk Warrior) tried to fix it but failed… it works on it, rebuilds it, but cannot replace the directory consequently I am stocked and DW tells me to make a backup format the drive and then reinstall… Funnily I am on the HDD on the Win10 Boot Camp, and I can access the D: drive SSD Mac OS and see and access everything even open files Mac files such as docx, xls, pdf… on Win10

Well the issue is that I am not in a modern country, I’m in Africa and where I am no Apple Shop, the nearest one is 900 miles away in Nairobi… And I’ve got a lot of work at the moment and can’t afford to lose days without my MacBook Pro... So maybe someone has an idea how to resolve it and up to the challenge...

Looking forward hearing from you guys…

Thanks,

You can quit the installer from the drop down menu.

You can launch it again from the Applications folder:  "Install macOS Sierra.app"

Hi there,

Even by quitting the macOS Sierra installer and then restarting, it doesn't... when rebooting it goes straight back to the macOS Installer...

You may be able to start up in Safe mode... this could help if it works

because it may try to repair the damages to the system it had installed.

Hold the Shift key down on startup to try to boot in Safe mode. It will

take some time, and you would be expected to enter your Admin PW

to get into Safe mode desktop.

• Try safe mode if your Mac doesn't finish starting up - Apple Support