[AT&T LG G3] Fivefold:
Hello everyone,

I have a really strange problem trying to flash kitkat on my D850 via LG FlashTool/Tot method as described here: https://xdaforums.com/att-lg-g3/general/unroot-return-to-factory-stock-att-lg-g3-t2820827

I searched everywhere but apparently no one has had this specific problem before.

The problem is that the phone will randomly seemingly freeze and turn off during flashing. After turning off it will immediately turn on again and reconnect to the PC in HS-USB QDLoader 9008 mode. If I pull the battery and reconnect I can get into download mode again just fine.

This happens at completely random times, sometimes at 11 % completion, sometimes at 34 %, sometimes at 80 %, but usually in the range of 3-20 % on the phone screen or a bit more in flashtool.

I know that it can actually successfully complete but that has been only once out of several hundred tries. I have tried every possible thing that has been suggested before, such as:

Using flash tool in Win7 compatibility mode (on Win 10)

Using Windows 7

Using stock USB cable and different USB cables

Using various USB 2.0 and USB 3.0 Ports

Using UPGRADE DL Mode and BOARD DL Mode in FlashTool

Using LG Flashtool Versions V1.8.1.1023 and V1.8.6.527

After the disconnect and timeout the Flashtool says: "We can't communicate with Phone"

This is the end of the log file, showing the phone disconnect:

[19:43: 4] [T1048608] 57 52 54 45 0E 00 00 00 00 D0 0C 00 00 00 00 00 00 00 00 00 00 00 10 00 B7 A2 00 00 A8 AD AB BA WRTE............................
[19:43: 4] [R000032] 57 52 54 45 0E 00 00 00 00 00 A0 19 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 A8 AD AB BA WRTE............................

[19:43: 4] [T1048608] 57 52 54 45 0E 00 00 00 00 D8 0C 00 00 00 00 00 00 00 00 00 00 00 10 00 79 EA 00 00 A8 AD AB BA WRTE....................y.......
[19:43: 4] [R000032] 57 52 54 45 0E 00 00 00 00 00 B0 19 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 A8 AD AB BA WRTE............................

[19:43:14] [T1048608] 57 52 54 45 0E 00 00 00 00 E0 0C 00 00 00 00 00 00 00 00 00 00 00 10 00 02 18 00 00 A8 AD AB BA WRTE............................
[19:43:19] RX Timeout : 5000 seconds
[19:43:19] LAF_Packet Error, Error reason is 0
[19:43:19] We can't communicate with Phone[WRTE_Packet]
[19:43:19] Port Close
[19:43:20] [T1048608] 57 52 54 45 0E 00 00 00 00 E0 0C 00 00 00 00 00 00 00 00 00 00 00 10 00 02 18 00 00 A8 AD AB BA WRTE............................
[19:43:25] RX Timeout : 5000 seconds
[19:43:25] LAF_Packet Error, Error reason is 0
[19:43:25] We can't communicate with Phone[WRTE_Packet]
[19:43:25] Write error
[19:43:25] We can't communicate with Phone[CLSE_Packet]
[19:43:25] *********************************************************************************************
[19:43:25] Elapsed time 0:00:27.6 Sec (0.0 sec) file size = 170496KBytes Speed = 6314 Kbps
[19:43:25] *********************************************************************************************
[19:43:25] Port is already closed
[19:43:25] Port opend failed -
[19:43:25] Retry download 2 time(s)
[19:43:25] We can't communicate with Phone[HELO_Packet]
[19:43:30] We can't communicate with Phone[EXEC_Packet]
[19:43:30] Port is already closed
[19:43:30] MasterBinBoardDLProcess() Error.
[19:43:30] ¡Ú¡Ú ERROR REASON : LAF_ERROR_PACKET_TIMEOUT
[19:43:30] CBasicComControl::IsConnected, the port(COM41) connection is not detected
[19:43:30] RunProcess() is fail.
[19:43:30] CBasicComControl::IsConnected, the port(COM41) connection is not detected
[19:43:30] [19:43:30] We can't communicate with Phone[EXEC_Packet]

[19:43:30] DoDownload() Exception

Any suggestions or ideas? Because it completed that one time I have been trying to do it again for the last few days but after hundreds of tries I'm willing to try something different :)