Issue installing Win8.1 on Retina MBP 15"

[Rlnplehshalo]

Hi all,

I have an early 2014 Retina macbook pro 15" baseline model and have installed and had windows 7 running flawlessly under bootcamp ever since I got it a week after release. However now as I want to upgrade to windows 8.1 I have encountered a serious problem.
To outline my process:
1. I created an ISO and placed it onto an 8GB USB
2. Launched the installer from windows 7 booted through bootcamp
3. Installation ran fine and the operating system even booted fine for the first time

The problem occurs after rebooting a second time (noting that I just installed the bootcamp drivers via USB), a popup then appears stating that "we couldnt install windows 8.1" and that it is restoring your previous version of windows.
After which windows 7 is restored as before.

I have heard issues regarding EFI and UEFI but am not sure as to what the exact details are and whether there is a fix?

Thanks in advance,
rlnplehshalo

 

[maflynn]

Did you try to create the USB through the bootcamp assistant? I've seen threads where upgrading to 8.1 is really difficult on Macs running win7 for some reason.

 

[Rlnplehshalo]

Did you try to create the USB through the bootcamp assistant? I've seen threads where upgrading to 8.1 is really difficult on Macs running win7 for some reason.

I just extracted the ISO to the USB not doing it through bootcamp, but I suppose trying that is worth a shot. I'll post back with the results.