[Upgrading, Modifying and Unlocking] lil chickenz:
I'm not sure what's wrong but here's the end of my log:

11/20/2018 21:03:41.940 FlashTool[22708][22416][D]: BromBootArg::cb_download_da_init(): Download DA now...(..\..\flashtool\Arg\BootRomArg.cpp,201)
11/20/2018 21:03:41.985 FlashTool[22708][22416][D]: BromBootArg::cb_download_da(): The sent_bytes is 32768(..\..\flashtool\Arg\BootRomArg.cpp,222)
11/20/2018 21:03:41.985 FlashTool[22708][22416][D]: BromBootArg::cb_download_da(): The total_bytes is 97000(..\..\flashtool\Arg\BootRomArg.cpp,223)
11/20/2018 21:03:42.006 FlashTool[22708][22416][D]: BromBootArg::cb_download_da(): The sent_bytes is 65536(..\..\flashtool\Arg\BootRomArg.cpp,222)
11/20/2018 21:03:42.006 FlashTool[22708][22416][D]: BromBootArg::cb_download_da(): The total_bytes is 97000(..\..\flashtool\Arg\BootRomArg.cpp,223)
11/20/2018 21:03:42.027 FlashTool[22708][22416][D]: BromBootArg::cb_download_da(): 100% of DA has been sent.(..\..\flashtool\Arg\BootRomArg.cpp,218)
11/20/2018 21:03:42.034 FlashTool[22708][22416][D]: BromBootArg::cb_download_da(): The sent_bytes is 97000(..\..\flashtool\Arg\BootRomArg.cpp,222)
11/20/2018 21:03:42.034 FlashTool[22708][22416][D]: BromBootArg::cb_download_da(): The total_bytes is 97000(..\..\flashtool\Arg\BootRomArg.cpp,223)
11/20/2018 21:03:42.119 FlashTool[22708][22416][D]: APCore::Connection::ConnectDA(): Failed to Connect DA: S_BROM_DOWNLOAD_DA_FAIL(..\..\flashtool\Conn\Connection.cpp,130)
11/20/2018 21:03:42.144 FlashTool[22708][22416][D]: APCore::Connection::Disconnect(): Disconnect!(..\..\flashtool\Conn\Connection.cpp,140)
11/20/2018 21:03:52.256 FlashTool[22708][22416][D]: APCore::DAHandle::~DAHandle(): dtor of DAHandle(..\..\flashtool\Resource\Handle\DAHandle.cpp,25)
11/20/2018 21:03:52.266 FlashTool[22708][22416][D]: APCore::DLHandle::~DLHandle(): dtor of DLHandle(..\..\flashtool\Resource\Handle\DLHandle.cpp,23)
11/20/2018 21:03:52.266 FlashTool[22708][22416][D]: APCore::RBHandle::~RBHandle(): dtor of RBHandle(..\..\flashtool\Resource\Handle\RBHandle.cpp,19)
11/20/2018 21:03:52.267 FlashTool[22708][22416][D]: APCore::RBHandle::~RBHandle(): RB_ClearAll(0)(..\..\flashtool\Resource\Handle\RBHandle.cpp,21)
11/20/2018 21:03:52.267 FlashTool[22708][22416][D]: APCore::RBHandle::~RBHandle(): RB_Destroy(0)(..\..\flashtool\Resource\Handle\RBHandle.cpp,23)
11/20/2018 21:03:52.267 FlashTool[22708][22416][D]: APCore::ScretHandle::~ScretHandle(): dtor of ScretHandle(..\..\flashtool\Resource\Handle\ScretHandle.cpp,23)
11/20/2018 21:03:52.268 FlashTool[22708][22416][D]: APCore::AuthHandle::~AuthHandle(): dtor of auth handle.(..\..\flashtool\Resource\Handle\AuthHandle.cpp,22)
11/20/2018 21:03:52.268 FlashTool[22708][22416][D]: main(): Uncaught BaseException in main(): BROM ERROR : S_BROM_DOWNLOAD_DA_FAIL (0x7D4)

[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.
(APCore::Connection::ConnectDA,..\..\flashtool\Conn\Connection.cpp,131)(..\..\flashtool\main.cpp,101)

Logger deinited.

Something I've noticed is that the failure seems to happen just as the phone boots up shortly after the tool starts