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Problems installing OSX from bootable USB drive

I'm trying to downgrade from 10.8.3 to 10.7.5, mainly because of the reduced battery life in Mountain Lion.

I have created a bootbale USB thumbdrive with 10.7.5 on it.

I restart the machine holding down the Option key, but the USB drive does not appear in the available drives. All that appears is the Macintosh HD and the 10.8.3 recovery.

Why is the USB not appearing.

I have a retina MacBook Pro 15 from mid 2012. It was shipped with Lion.

Nigel

MacBook Pro with Retina display, OS X Mountain Lion (10.8.3)

Posted on Apr 18, 2013 12:38 AM

16 replies

cbs20

Level 4

2,796 points

Apr 22, 2013 7:37 PM in response to clashcityrocker1

No problem, it's kind of BS that these retinas can't boot from USB 3.0

Problems installing OSX from bootable USB drive

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