Well did it work for you or what?
u have to format preload..
mine was i backup my dats ...go back to stock pre rooted gb> full wipe> flash burtrom>and it work as usual...
need a bit work but mine work splendid..
my problem was my external sd card(SDCARD) was suddenly unusable..so i had to use other sdcard to perform abover mention flashing method...
i gues its not really safe to flash jb over jb.... since in the OP said that preload miight be mismatch...
Camera apk is not the same as xxlsz.?.since now i cant find option to turn off the shutter sound