This Samsung JIG can clear your flash counter or install custom ROM on your Samsung Android Phone. You need to clear the flash counter if your phone needs warranty service, so that samsung will not you rooted your phone or flashed ROM. If something goes wrong when you root or flash ROM, this USB Jig can turn your bricked/semi-bricked phone into download mode again. 

Instructions

• Turn off your phone and pull out the battery.
• Just put the battery back and don’t turn it on.
• Plug the module into the micro USB port on the phone.
• After about 2 seconds, you can see the yellow download mode logo on the screen.
• Unplug the module.
• Connect your phone with USB cable to computer and then flash your phone via the program “odin”.
• Accessory ONLY, PHONE is not included.