I tried to flash a Samsung X640c, but failed as shows below:

//result
MCU File: x64cdzed5.cla CheckSum: 5B1EAA4B
TFS File: x64cdzed5.tfs CheckSum: 258BA8A1
CFG File: x64cdzed5.cfg 11220 byte(s)
1st Boot Failed: Power-Up

BUT CABLE OK, I CAN UNLOCK X640C, DONE , CAN READ INFO DONE, BUT CANT FLASH, WHY?