corona v6 - mrf: 2013/11

Hi guys. I have a Corona v6 with MRF date: 2013/11/xx and I can boot xell. But when I make freeboot and write it, didn't boot well. The green LED of PCB board blinking sohrt. Some time blinking long and it's not ordered. What can I do? Please help me friends. :( I do more than 500 RGH, But I...