there is no cab file for anything you need to do.
1.download the sprint shipped rom
here.
2.then extract it with a program called WinRar.
3.then you will see the ruu_signed.nbh file that you just extracted from the sprint shipped rom.
4.then you need to rename it from ruu_signed.nbh to RAPHIMG.nbh.
5.then put that file on your mem card.
6.then you need to put your phone into bootloader mode: hold the Volume Down and Power button simultaneously. While you're still holding those 2 buttons, press the reset button with your stylus.
then your phone will read the nbh file you put on the mem card and ask if you want to flash it.