Installing windows on Mac won't recognize USB I am trying to install windows as a boot camp partition on my main hard drive ssd (after spending countless hours trying to get it installed on the optical bay hard drive).

I assumed this would be simple since o am no longer trying to install to an "external" hard drive. But it has turned out to be just as difficult.

The biggest problem I am encountering is that i have a 2010 15" macbook pro which originally came with an optical drive which i have replaced with a Hard disk and the main drive is now an ssd also I am trying to install windows 7. I tried modifying my info.plist so i could create a USB install of my windows iso but when I create a boot camp partition and hit install it restarts into a gray screen and nothing happens. If I attempt to force restart from this It boots into an apple logo that hangs until it goes to a black screen that says "No bootable device found - please insert a bootable device and hit any key." I then force restarted and held down option and when it loaded it didn't show my USB as a device (only my main ssd drive and my optical bay hard disk).

I found a YouTube video of a Czech guy who used virtual box to start the install and then move it to the desired disk and used refit to access it, but when I installed refit it didn't even show up in my boot devices when I held down option... 

My question is how I can go about installing windows 7 on my 2010 macbook pro that has an ssd in the main hard drive and a hard disk on the optical bay drive. It can be installed to either disk but I suppose the ssd would be better since its faster to boot. I have a working ISO (showed working from virtual box installs) and a USB drive.
Since this question has been marked as a duplicate, I have moved my answer to the other question. Please see my answer posted at Boot camp install of Windows 7 issue, no bootable devices.