I was actually able to downgrade a Boost Blackberry from 5.0 to 4.5.0.66 from U.S Cellular. I wiped the OS off of the device and then reloaded the U.S Cellular OS to the device. You do have to delete the vendor.xml file first. Once you get the U.S Cellular O.S on the device, you will be able to read the SPC.
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