MFGTool stuck at loading U-boot?

I tried flashing twice and it always get stuck at  "Loading U-boot", here is the log file:

DLL version: 2.2.3

Saturday, March 21, 2015 21:22:38   Start new logging

ModuleID[2] LevelID[10]: CMyExceptionHandler thread is running

ModuleID[2] LevelID[1]: new MxHidDeviceClass

ModuleID[2] LevelID[10]: new MxHidDevice[00A29030]

ModuleID[2] LevelID[10]: DeviceTypeDisk--_devices size: 2

ModuleID[2] LevelID[10]: Volume--StorageDisk, Disk->_driveNumber:2, Volume->_diskNumber:2

ModuleID[2] LevelID[10]: DeviceTypeDisk--find Disk device: 00A32548

ModuleID[2] LevelID[10]: Device::hubIndex::getmsc, return the port index is: 1

ModuleID[2] LevelID[10]: Device Manager thread is running

ModuleID[2] LevelID[10]: CmdOperation[0] device chagned and reset to state 0

ModuleID[2] LevelID[10]: ExecuteCommand--Boot[WndIndex:0], File is C:\Users\kk\Desktop\image_SVN2487\Mfgtools-Rel-4.1.0_130816_MX6DL_UPDATER\Profiles\MX6DL Linux Update\OS Firmware\u-boot-mx6solo-RIoTboard.bin

ModuleID[2] LevelID[10]: ExecuteCommand--Load[WndIndex:0], File is C:\Users\kk\Desktop\image_SVN2487\Mfgtools-Rel-4.1.0_130816_MX6DL_UPDATER\Profiles\MX6DL Linux Update\OS Firmware\uImage, address is 0x10800000

ModuleID[2] LevelID[10]: PortMgrDlg(0)--Command Load excute successfully, retry count: 0

ModuleID[2] LevelID[10]: ExecuteCommand--Load[WndIndex:0], File is C:\Users\kk\Desktop\image_SVN2487\Mfgtools-Rel-4.1.0_130816_MX6DL_UPDATER\Profiles\MX6DL Linux Update\OS Firmware\initramfs.cpio.gz.uboot, address is 0x10C00000

ModuleID[2] LevelID[10]: PortMgrDlg(0)--Command Load excute successfully, retry count: 0

ModuleID[2] LevelID[10]: ExecuteCommand--Jump[WndIndex:0]

ModuleID[2] LevelID[10]: *********MxHidDevice[00A29030] Jump to Ramkernel successfully!**********

ModuleID[2] LevelID[10]: CmdOperation[0], current state command has been finished and the last command is successful, so SetEvent(hDevCanDeleteEvent)

ModuleID[2] LevelID[10]: CmdOperation[0] device chagned and reset to state 0

ModuleID[2] LevelID[10]: ExecuteCommand--Boot[WndIndex:0], File is C:\Users\kk\Desktop\image_SVN2487\Mfgtools-Rel-4.1.0_130816_MX6DL_UPDATER\Profiles\MX6DL Linux Update\OS Firmware\u-boot-mx6solo-RIoTboard.bin