hmm. now im even more confused. your phone is being used on a cdma carrier,correct? is it using a sim card?
i would think youd share a model number and and product number with the sprint one(m7_wls)
but... you are m7_ul,and model id 712000,both of wich are consistent with the AT&T version.
best guess at this point,is that maybe your unique configuration does require its own image,i will dig around and see what i can find out