com portName is: /dev/ttyACM0

Total wait time = -1476899503.000000
USB port is obtained. path name(/dev/ttyACM0), port name(/dev/ttyACM0)
USB port detected: /dev/ttyACM0
BROM connected
Downloading & Connecting to DA...
connect DA end stage: 2, enable DRAM in 1st DA: 0
COM port is open. Trying to sync with the target...
Failed to Connect DA: S_BROM_DOWNLOAD_DA_FAIL
Disconnect!
BROM Exception! ( ERROR : S_BROM_DOWNLOAD_DA_FAIL (2004)

[H/W] Fail to download DA to baseband chip's internal SRAM!
[HINT]:
1. There's an cable communication problem between FlashTool and BootROM.
2. Target might be shutdown unexpectedly or target lost power supply.
[ACTION]
1. Try again.
2. Proceed H/W checking in download cable and target side com port.
3. Monitor if power-drop occured in target side.)((ConnectDA,../../../flashtool/Conn/Connection.cpp,131))

DEBUG: Boot_FlashTool(): Cable Type - UART (brom_mt6276.cpp:1307)
10/19/16 23:01:30.918 BROM_DLL[7820][7845]: DEBUG: Boot_FlashTool(): SV5 starts... (brom_mt6276.cpp:1310)
10/19/16 23:01:30.918 BROM_DLL[7820][7845]: DEBUG: Boot_FlashTool(): CALLBACK_COM_INIT_STAGE(0x0048C970).... (brom_mt6276.cpp:1321)
10/19/16 23:01:30.919 BROM_DLL[7820][7845]: DEBUG: BRom_GetBootLoaderVer(): enter ... (brom_base.cpp:1808)
10/19/16 23:01:30.922 BROM_DLL[7820][7845]: WARN: BRom_GetBootLoaderVer(): BLDR_CMD_GET_BLDR_VER(0xFE) is not support! (brom_base.cpp:1822)
10/19/16 23:01:30.923 BROM_DLL[7820][7845]: BRom_PowerKeyLockSentry(): execute m_base.SetReg_LockPowerKey(). (brom_base.cpp:2154)
10/19/16 23:01:30.923 BROM_DLL[7820][7845]: DEBUG: BRom_GetVer(): enter ... (brom_base.cpp:1689)
10/19/16 23:01:31.030 BROM_DLL[7820][7845]: DEBUG: BRom_GetVer(): ver(0x41). (brom_base.cpp:1712)
10/19/16 23:01:31.030 BROM_DLL[7820][7845]: DEBUG: BRom_GetBootLoaderVer(): enter ... (brom_base.cpp:1808)
10/19/16 23:01:31.032 BROM_DLL[7820][7845]: WARN: BRom_GetBootLoaderVer(): BLDR_CMD_GET_BLDR_VER(0xFE) is not support! (brom_base.cpp:1822)
10/19/16 23:01:31.032 BROM_DLL[7820][7845]: ERROR: onDAWillBeDownloaded(): (0x7fc9e800da40): Unsupported BootROM version! m_brom_ver(0x41). (secure_handle_brom.cpp:161)
10/19/16 23:01:31.032 BROM_DLL[7820][7845]: ~BRom_PowerKeyLockSentry(): execute m_base.SetReg_ReleasePowerKey(). (brom_base.cpp:2165)
10/19/16 23:01:31.032 BROM_DLL[7820][7845]: Boot_FlashTool(): DA_HANDLE->rwlock: READ_UNLOCK. (rwlock.cpp:339)
10/19/16 23:01:31.032 BROM_DLL[7820][7845]: ERROR: pre_download_da(): S_UNSUPPORTED_VER_OF_BOOT_ROM(1020),ft_handle(0xE800D1B0): Boot_FlashTool(): fail! (flashtool_api.cpp:1563)
10/19/16 23:01:31.032 BROM_DLL[7820][7845]: pre_download_da(0x7fc9e800d1b0): DA_HANDLE->rwlock: READ_UNLOCK. (rwlock.cpp:339)
10/19/16 23:01:31.032 BROM_DLL[7820][7845]: ERROR: FlashTool_Connect_Download_InitDA(): FlashTool_Connect_Download_InitDA() fail, error S_UNSUPPORTED_VER_OF_BOOT_ROM(1020) (flashtool_api.cpp:1620)
10/19/16 23:01:31.033 BROM_DLL[7820][7845]: ERROR: FlashTool_Connect_Download_InitDA(): <ERR_CHECKPOINT>[150][error][1020]</ERR_CHECKPOINT> [S_UNSUPPORTED_VER_OF_BOOT_ROM] (flashtool_api.cpp:1622)
10/19/16 23:01:31.033 BROM_DLL[7820][7845]: ERROR: FlashTool_Connect_Download_DA(): S_UNSUPPORTED_VER_OF_BOOT_ROM(1020),ft_handle(0xE800D1B0): FlashTool_Connect_Download_InitDA(): fail! (flashtool_api.cpp:1474)
10/19/16 23:01:31.033 BROM_DLL[7820][7845]: ERROR: FlashTool_Connect_Download_DA(): <ERR_CHECKPOINT>[149][error][1020]</ERR_CHECKPOINT> [S_UNSUPPORTED_VER_OF_BOOT_ROM] (flashtool_api.cpp:1476)
10/19/16 23:01:31.034 BROM_DLL[7820][7845]: FlashTool_Disconnect(0xE800D1B0): mutex: LOCK ... (mutex.cpp:151)
10/19/16 23:01:31.034 BROM_DLL[7820][7845]: DEBUG: CMD_Finish(): Send DA_FINISH_CMD(0xD9), device_status(DISCONNECT_USB_AND_RELEASE_POWERKEY). (da_cmd.cpp:1048)
10/19/16 23:01:31.044 BROM_DLL[7820][7845]: ERROR: CMD_Finish(): Error return(3). (da_cmd.cpp:1082)
10/19/16 23:01:31.055 BROM_DLL[7820][7845]: DEBUG: CMD_Finish(): OK! (da_cmd.cpp:1088)
10/19/16 23:01:31.055 BROM_DLL[7820][7845]: ERROR: FlashTool_Disconnect(): (0xE800D1B0): da_cmd.CMD_Finish(): fail! (flashtool_api.cpp:2324)
10/19/16 23:01:31.055 BROM_DLL[7820][7845]: FlashTool_Disconnect(0xE800D1B0): mutex: UNLOCK. (mutex.cpp:166)
10/19/16 23:01:31.055 BROM_DLL[7820][7845]: com_base::close(/dev/ttyACM0): tty(12) OK! (com_base.cpp:455)
10/19/16 23:01:31.056 BROM_DLL[7820][7845]: com_sentry::Close(0x7fc9e800da40): OK!! (com_sentry.cpp:409)
10/19/16 23:01:31.056 BROM_DLL[7820][7845]: DEBUG: FlashTool_Disconnect(): successfully done. (flashtool_api.cpp:2336)
10/19/16 23:01:31.118 BROM_DLL[7820][7820]: RB_ClearAll(): RB_HANDLE->rwlock: WRITE_TRYLOCK, OK! (rwlock.cpp:362)
10/19/16 23:01:31.119 BROM_DLL[7820][7820]: RB_ClearAll(): RB_HANDLE->rwlock: WRITE_UNLOCK. (rwlock.cpp:392)