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Downgrade from OX El Capitanin a new Mac Book Pro

Rule of thumb: you cannot install an earlier version of OS X than what was installed at purchase. Usually because earlier versions of OS X do not contain necessary drivers for the newest hardware. There are very few exceptions to this rule.
 
snaky69 said:
Rule of thumb: you cannot install an earlier version of OS X than what was installed at purchase. Usually because earlier versions of OS X do not contain necessary drivers for the newest hardware. There are very few exceptions to this rule.
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The 2015 MacBook Pro was released with Yosemite, so 10.10 is supported for sure
 
Max(IT) said:
The 2015 MacBook Pro was released with Yosemite, so 10.10 is supported for sure
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Yes, but something as silly as the El Capitan install installing a new Boot ROM could render an install impossible.

Unless someone has specifically tried this, I wouldn't count on it being doable.

EDIT: A lot of people were doing it back in 2011 when the late 2011's came out with OS X Lion instead of Snow Leopard. As I recall, the install itself was easy, securing a 10.6.X disc that would boot was not. Retail copies (10.6.0) did not work and the grey discs of the previous machines did not either.
 
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navaira said:
That's what I was wondering – if the same hardware WAS released with Yosemite, why would it be impossible to install it? (My curiosity is purely theoretical, no need for me to check)
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It surely is possible, but I can't see a single reason to downgrade to Yosemite.
 
snaky69 said:
Yes, but something as silly as the El Capitan install installing a new Boot ROM could render an install impossible.

Unless someone has specifically tried this, I wouldn't count on it being doable.

EDIT: A lot of people were doing in back in 2011 when the late 2011's came out with OS X Lion instead of Snow Leopard. As I recall, the install itself was easy, securing a 10.6.X disc that would boot was not. Retail copies (10.6.0) did not work and the grey discs of the previous machines did not either.
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My new MacBook Pro 2015 bought in October shipped with 10.10 (10.11 was released just 5 days before the purchase). No new EFI was released since then.
 
Hi all,
As suggested the installation of Yosemite works fine.

Mavericks works only on virtual box.
Thank you
 
I really screwed up. I upgraded a mid-2015 rMPB from Yos to El Cap -- I mean, it made sense at the time. Then I discovered that El Cap is incompatible with ProTool's MBox3 interface. Avid still has not published a driver update. It could be a long time before they do - - - I can't run ProTools on my new MPB. AND SINCE I DID NOT DO A TIME MACHINE backup when I got my machine I would have to go through the really treacherous USB drive boot install. I don't know why Apple makes this so damn difficult. I miss the days of getting boot drives on DVD when we upgraded the OS.
 
snaky69 said:
Yes, but something as silly as the El Capitan install installing a new Boot ROM could render an install impossible.
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Apple has never issued a Mac firmware update that locked out a previously installable version of OS X.
There is no issue putting 10.10.5 on these computers.
 
chrfr said:
Apple has never issued a Mac firmware update that locked out a previously installable version of OS X.
There is no issue putting 10.10.5 on these computers.
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Oh, it can be done - sure - but making a boot drive and doing a correct install is not easy. Did Apple make it impossible - no. Did Apple intentionally make it a friggin' pain-in-the-ass - absolutely.
 
Thanks, Coastal - I will be trying that if AVID does not publish a new driver byJan. 1.
BIG QUESTION - I have read that doing any kind of backwards install requires that the current hard drive be erased. I am not sure how to accomplish this without making a USB boot drive with Utilities on it - - - - and I don't think that El Capitan Disk Utilities comes with the option to zero format or write over drives anymore. I also have a SSD drive on the rMPB and I understand that wants to be treated differently that spin-up HD's.
 
Kevinsocal said:
Thanks, Coastal - I will be trying that if AVID does not publish a new driver byJan. 1.
BIG QUESTION - I have read that doing any kind of backwards install requires that the current hard drive be erased. I am not sure how to accomplish this without making a USB boot drive with Utilities on it - - - - and I don't think that El Capitan Disk Utilities comes with the option to zero format or write over drives anymore. I also have a SSD drive on the rMPB and I understand that wants to be treated differently that spin-up HD's.
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As I said previously, boot into Internet Recovery and install your MBP's OS that it shipped with. I found these instructions using a google search:
http://osxdaily.com/2014/12/14/reinstall-os-x-mac-internet-recovery/
 
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