Hi Peter,
Could you give me any suggestions? I meet a similar problem. 
Here is my mfgtool.log
DLL version: 2.3.4
Monday, July 17, 2017 16:50:42 Start new logging
ModuleID[2] LevelID[10]: CMyExceptionHandler thread is running
ModuleID[2] LevelID[1]: new MxHidDeviceClass
ModuleID[2] LevelID[10]: Device Manager thread is running
ModuleID[2] LevelID[10]: DeviceManager::DevChangeWnd::OnDeviceChange() - DEVICE_ARRIVAL_EVT(\\?\USB#VID_15A2&PID_0061#7&2486a4ed&0&3#{a5dcbf10-6530-11d2-901f-00c04fb951ed})
ModuleID[2] LevelID[10]: DeviceManager::DevChangeWnd::OnDeviceChange() - end
ModuleID[2] LevelID[10]: DeviceManager::OnMsgDeviceEvent() - DEVICE_ARRIVAL_EVT(\\?\USB#VID_15A2&PID_0061#7&2486a4ed&0&3#{a5dcbf10-6530-11d2-901f-00c04fb951ed})
ModuleID[2] LevelID[10]: DeviceClass::FindDeviceByUsbPath--DeviceListType_Current, _devices.size: 0
ModuleID[2] LevelID[1]: DeviceClass::FindDeviceByUsbPath() - DeviceListType_New--index: 0
ModuleID[2] LevelID[1]: DeviceClass::FindDeviceByUsbPath() - DeviceListType_New--devPath: \\?\hid#vid_046d&pid_c52f&mi_00#8&40d7469&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
ModuleID[2] LevelID[1]: DeviceClass::FindDeviceByUsbPath() - DeviceListType_New--index: 1
ModuleID[2] LevelID[1]: DeviceClass::FindDeviceByUsbPath() - DeviceListType_New--devPath: \\?\hid#vid_046d&pid_c52f&mi_01&col01#8&1fc9c959&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
ModuleID[2] LevelID[1]: DeviceClass::FindDeviceByUsbPath() - DeviceListType_New--index: 2
ModuleID[2] LevelID[1]: DeviceClass::FindDeviceByUsbPath() - DeviceListType_New--devPath: \\?\hid#vid_046d&pid_c52f&mi_01&col02#8&1fc9c959&0&0001#{4d1e55b2-f16f-11cf-88cb-001111000030}
ModuleID[2] LevelID[1]: DeviceClass::FindDeviceByUsbPath() - DeviceListType_New--index: 3
ModuleID[2] LevelID[1]: DeviceClass::FindDeviceByUsbPath() - DeviceListType_New--devPath: \\?\hid#vid_046d&pid_c52f&mi_01&col03#8&1fc9c959&0&0002#{4d1e55b2-f16f-11cf-88cb-001111000030}
ModuleID[2] LevelID[1]: DeviceClass::FindDeviceByUsbPath() - DeviceListType_New--index: 4
ModuleID[2] LevelID[1]: DeviceClass::FindDeviceByUsbPath() - DeviceListType_New--devPath: \\?\hid#vid_047f&pid_c01f&mi_03&col01#9&2c77b98b&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
ModuleID[2] LevelID[1]: DeviceClass::FindDeviceByUsbPath() - DeviceListType_New--index: 5
ModuleID[2] LevelID[1]: DeviceClass::FindDeviceByUsbPath() - DeviceListType_New--devPath: \\?\hid#vid_047f&pid_c01f&mi_03&col02#9&2c77b98b&0&0001#{4d1e55b2-f16f-11cf-88cb-001111000030}
ModuleID[2] LevelID[1]: DeviceClass::FindDeviceByUsbPath() - DeviceListType_New--index: 6
ModuleID[2] LevelID[1]: DeviceClass::FindDeviceByUsbPath() - DeviceListType_New--devPath: \\?\hid#vid_047f&pid_c01f&mi_03&col03#9&2c77b98b&0&0002#{4d1e55b2-f16f-11cf-88cb-001111000030}
ModuleID[2] LevelID[1]: DeviceClass::FindDeviceByUsbPath() - DeviceListType_New--index: 7
ModuleID[2] LevelID[1]: DeviceClass::FindDeviceByUsbPath() - DeviceListType_New--devPath: \\?\hid#vid_15a2&pid_0061#8&2015c9c8&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
ModuleID[2] LevelID[10]: new MxHidDevice[007C9A38]
ModuleID[2] LevelID[10]: DeviceClass::FindDeviceByUsbPath--DeviceListType_New, devInstPathToFind: USB\VID_15A2&PID_0061\7&2486A4ED&0&3, _deviceInstanceID: USB\VID_15A2&PID_0061\7&2486A4ED&0&3
ModuleID[2] LevelID[10]: DeviceClass::FindDeviceByUsbPath--DeviceListType_New, Find the device, Port: 3
ModuleID[2] LevelID[10]: DeviceClass::AddUsbDevice() successful USB#VID_15A2&PID_0061#7&2486A4ED&0&3#{A5DCBF10-6530-11D2-901F-00C04FB951ED} add to current list, retrycount: 0
ModuleID[2] LevelID[10]: DeviceManager::OnMsgDeviceEvent() - DEVICE_ARRIVAL_EVT,[MxHidDeviceClass] vid_15a2&pid_0061, Hub:5-Port:3
ModuleID[2] LevelID[10]: DeviceManager::OnMsgDeviceEvent() - DEVICE_ARRIVAL_EVT, Notify
ModuleID[2] LevelID[10]: CmdOpreation[0]--OnDeviceChangeNotify, Volume Arrive/Remove or Device Arrive/Remove
ModuleID[2] LevelID[10]: CmdOpreation[0]--OnDeviceChangeNotify, m_p_usb_port is not NULL, so only refresh
ModuleID[2] LevelID[10]: CmdOpreation[0]--OnDeviceChangeNotify, Volume/Device Arrive
ModuleID[2] LevelID[1]: CmdOpreation[0]--set m_hDeviceArriveEvent.
ModuleID[2] LevelID[10]: CmdOpreation[0]--WaitforEvents device arrive1
ModuleID[2] LevelID[10]: CmdOperation[0] device chagned and reset to state 0
ModuleID[2] LevelID[10]: ExecuteCommand--Boot[WndIndex:0], File is D:\mfgtools\Profiles\Update\OS Firmware\u-boot.imx
ModuleID[2] LevelID[10]: ExecuteCommand--Load[WndIndex:0], File is D:\mfgtools\Profiles\Update\OS Firmware\uImage, address is 0x12000000
ModuleID[2] LevelID[10]: PortMgrDlg(0)--Command Load excute successfully, retry count: 0
ModuleID[2] LevelID[10]: ExecuteCommand--Load[WndIndex:0], File is D:\mfgtools\Profiles\Update\OS Firmware\xx_ramdisk.img, address is 0x12C00000
ModuleID[2] LevelID[10]: PortMgrDlg(0)--Command Load excute successfully, retry count: 0
ModuleID[2] LevelID[10]: ExecuteCommand--Load[WndIndex:0], File is D:\mfgtools\Profiles\Update\OS Firmware\imx6solo.dtb, address is 0x18000000
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[007C9A38] 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]: DeviceManager::DevChangeWnd::OnDeviceChange() - DEVICE_REMOVAL_EVT(\\?\USB#VID_15A2&PID_0061#7&2486a4ed&0&3#{a5dcbf10-6530-11d2-901f-00c04fb951ed})
ModuleID[2] LevelID[10]: DeviceManager::DevChangeWnd::OnDeviceChange() - end
ModuleID[2] LevelID[10]: DeviceManager::OnMsgDeviceEvent() - DEVICE_REMOVAL_EVT(\\?\USB#VID_15A2&PID_0061#7&2486a4ed&0&3#{a5dcbf10-6530-11d2-901f-00c04fb951ed})
ModuleID[2] LevelID[10]: DeviceClass::FindDeviceByUsbPath--DeviceListType_Current, _devices.size: 1
ModuleID[2] LevelID[10]: DeviceClass::FindDeviceByUsbPath--DeviceListType_Current, devInstPathToFind: USB\VID_15A2&PID_0061\7&2486A4ED&0&3, _deviceInstanceID: USB\VID_15A2&PID_0061\7&2486A4ED&0&3
ModuleID[2] LevelID[10]: DeviceClass::FindDeviceByUsbPath--DeviceListType_Current, Find the device
ModuleID[2] LevelID[10]: DeviceManager::OnMsgDeviceEvent() - DEVICE_REMOVAL_EVT,[MxHidDeviceClass] vid_15a2&pid_0061, Hub:5-Port:3
ModuleID[2] LevelID[10]: DeviceManager::OnMsgDeviceEvent() - DEVICE_REMOVAL_EVT, Notify
ModuleID[2] LevelID[10]: CmdOpreation[0]--OnDeviceChangeNotify, Volume Arrive/Remove or Device Arrive/Remove
ModuleID[2] LevelID[10]: CmdOpreation[0]--OnDeviceChangeNotify, m_p_usb_port is not NULL, so only refresh
ModuleID[2] LevelID[10]: CmdOpreation[0]--OnDeviceChangeNotify, Volume/Device Remove
ModuleID[2] LevelID[1]: CmdOpreation[0]--set m_hDeviceRemoveEvent.
ModuleID[2] LevelID[10]: CmdOpreation[0]--WaitforEvents device remove1
ModuleID[2] LevelID[10]: DeviceManager::OnMsgDeviceEvent()-DEVICE_REMOVAL_EVT, hDevCanDeleteEvent has been set
ModuleID[2] LevelID[10]: delete MxHidDevice[007C9A38]
ModuleID[2] LevelID[10]: DeviceManager::DevChangeWnd::OnDeviceChange() - DEVICE_ARRIVAL_EVT(\\?\USB#VID_0525&PID_A4A5#7&2486a4ed&0&3#{a5dcbf10-6530-11d2-901f-00c04fb951ed})
ModuleID[2] LevelID[10]: DeviceManager::DevChangeWnd::OnDeviceChange() - end
ModuleID[2] LevelID[10]: DeviceManager::OnMsgDeviceEvent() - DEVICE_ARRIVAL_EVT(\\?\USB#VID_0525&PID_A4A5#7&2486a4ed&0&3#{a5dcbf10-6530-11d2-901f-00c04fb951ed})