look 1st page
or below link
http://forum.xda-developers.com/showthread.php?t=1391881

Keep trying, that site is bugged.

Not from there. You download the firmware same as the place you download the USB drives from. From Samsung website.

unlock ur OEM, means ur phone is now fully customizable

can put any simcard
carrier = like maxis, celcom, digi ......

Sim unlock - A SIM lock, simlock, network lock or subsidy lock is a capability built into GSM phones by mobile phone manufacturers. Network providers use this capability to restrict the use of these phones to specific countries and network providers. Generally, phones can be locked to accept only SIM cards

Unlock Bootloader - bootloader is code that is executed before any Operating System starts to run. A bootloader is usually locked on an Android device because although it’s an open source OS, still the manufacturers want you to stick to their Android OS version specifically designed for the device. In order to apply this concept, manufacturers lock the bootloader. With a locked bootloader on Android devices, it is virtually impossible to flash a Custom ROM and forced attempts void warranty as well as usually end up in bricks. Therefore, the first step is to always unlock the bootloader.

first tell us wat u r expecting from the phone.
yes. faster hide, captain obvious is on his way.

you HAVE TO unlock dat goddamn bootloader first before you can proceed with the system changes including rooting, flashing, etc. thank god its samsung not htc, orelse u'll have a nightmare on removing the bootloader.