The ROM is dated you may want to try another ROM.
Pull battery out of phone and put it back in and do the following:
For recovery: hold volume up, home button and power button until you feel the phone vibrate and you see small blue text in the upper left side of the screen.
For download mode: volume down, home button and power button until you feel the device vibrate.
Sent from my SGH-T999 using XDA Premium 4 mobile app