Default Is it possible to load a SPR stock rom onto a S960L?

I'm trying to flash a Tracfone/Straight talk to cricket, but none of the 16 digit passwords work. So i was thinking if i can flash the SPR rom onto it, some people say it works, other says it will brick. The only thing i care about is either getting the s960l 16 digit password or make the phone act like its on sprint so i can use the spring 16 digit password.

Its a S960L on 4.1.2.
Baseband is S960LWYAMD6
Build: JZO54K.S960LWYAMD6

Another thought i had was can i just flash the sprint modem into this S960L? Would the 16 digit password change along with the modem?

thanks