firmware for sgh f500 needed...urgently.....i just bought the phone and i got this problem showing "PMP LOCKED"....i have tried every service center in my city but all in vein....so any kind of help would be highly appreciated ...thanks............problem coming on its pmp is

[AP PANIC]
code: 8500
file:...base\src\new.cpp
line:230
f5ooxxgb4
bnum3770
now rebooting