Feel free to Root, Hack, and Mod all you like. The FXZ files have been leaked for ICS 6.7.246 on the Droid Bionic. If you weren't aware the FXZ files are used to flash stock to your phone via fastboot and RSDlite. You can grab the files needed in the source link below. This is good news since Safestrap v3 was just released last week and developers Hashcode and Dhacker along with several other great developers have been making tons of great roms and other customizations lately.