I upgraded to TechTool Pro 8 and created a Protogo Basic USB. I tested the USB on the system on which the USB was created but the system will not boot. The progress bar gets about 1/3 of the way across the screen. My system in a iMac Retina 27" with OS X 10.10.3. I also tried it on a MacBookPro with 10.10.3 with the same result.
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