[G3 Q&A, Help & Troubleshooting] nomanghous@hotmail.com:
Hi

I ran into a problem last night when i accidentally flashed my LG G3 F400K with D850 firmware using TWRP. It bricked my phone. Whenever i boot i keep on showing "Fastboot mode started" but download mode is also working. So i tried to flash it back to stock using LG Flash Tool but i got download failed error. I have also attached the log file and error screenshot.

LOG FILE

[15:26:29] ¡Ú Tool : 1, 8, 1, 1023 : C:\LG\LGFLASHTOOL\LGFLASHTOOL.EXE

[15:26:29] ¡Ú DLL : 0.3.14.3 : G:\LG\New Folder\New folder\F400K.dll

[15:26:29] Process :

[15:26:29] BIN : G:\LG\New Folder\New folder\LGF400KAT-00-V10g-KT-KR-JUN-22-2014-0_2\LGF400KAT-00-V10g-KT-KR-JUN-22-2014+0.tot

[15:26:29] SCR :

[15:26:29] PRL : ;;;;;;;;;;

[15:26:29] ERI :

[15:26:29] + 1. Web Download Mode = -1

[15:26:29] + 4. Web param-Bin Version =

[15:26:29] Frmae Type : LGFlashTool

[15:26:29] Load : 38 Total : 4153712KB Avail : 2552444KB

[15:26:29] AvailPage : 3590872KB AvailVirtual : 1924452KB

[15:26:29] Total/Free of C:\ : 51649 MB / 4801 MB

[15:26:29]

¡Ú¡Ú¡Ú Factory Information ¡Ú¡Ú¡Ú

[15:26:29] 1. Model Name : LG-D850

[15:26:29] 2. SWV : LGD855AT-00-V20p-GLOBAL-COM-MAY-08-2015-32G+0

[15:26:29] 3. SWOV : LGD855AT-00-V20p-GLOBAL-COM-MAY-08-2015-32G+0

[15:26:29]

[15:26:29] CBasicComControl::IsConnected, the port(COM41) connection is not detected

[15:26:29] CBasicComControl::eek:pen, the port(COM 41) is constructed successfully => HANDLE : 0x3a8

[15:26:29] CPort::eek:penPort() Success. Port number is 41

[15:26:29] ---------------------------------------------------------------------------------

[15:26:29] SubProcess Name : NoOperationCmd

[15:26:29] [T000004] 06 4E 95 7E .N..

[15:26:30] [R000004] 02 6A D3 7E .j..

[15:26:30] Current Process : PROCESS_FAC_UPGRADE

[15:26:30] Binary Path : G:\LG\New Folder\New folder\LGF400KAT-00-V10g-KT-KR-JUN-22-2014-0_2\LGF400KAT-00-V10g-KT-KR-JUN-22-2014+0.tot

[15:26:30] Try opening G:\LG\New Folder\New folder\LGF400KAT-00-V10g-KT-KR-JUN-22-2014-0_2\LGF400KAT-00-V10g-KT-KR-JUN-22-2014+0.tot file

[15:26:30] Crc32OfTot : 0xBF32ADC5

[15:26:30] Tot File length verify : PASS 3067084800 / 3067084800

[15:26:30] #### [EXTENDED SUPER BOOST] ####

[15:26:30] *****************************************************************************

[15:26:30] *- LG-F400K PartitionTable Info -*

[15:26:30] *- SW Version : F400K10g

[15:26:30] *- SWFV :

[15:26:30] *- Build Type : user

[15:26:30] *- Binary Size: 3067084800 Bytes

[15:26:30] *****************************************************************************

[15:26:30] Index | Part Name | Start Sector | FileSize | No Of Sectors

[15:26:30] 0/ 0 | PrimaryGPT | 0x00000000 | 0x0000000000080000 | 0x00008000

[15:26:30] 0/ 1 | modem | 0x00008000 | 0x0000000003900000 | 0x00020000

[15:26:30] 0/ 2 | sbl1 | 0x00028000 | 0x0000000000080000 | 0x00000800

[15:26:30] 0/ 3 | dbi | 0x00028800 | 0x0000000000080000 | 0x00000800

[15:26:30] 0/ 4 | aboot | 0x00029000 | 0x0000000000180000 | 0x00001000

[15:26:30] 0/ 5 | rpm | 0x0002A000 | 0x0000000000080000 | 0x00000800

[15:26:30] 0/ 6 | tz | 0x0002A800 | 0x0000000000080000 | 0x00005800

[15:26:30] 0/ 7 | boot | 0x00030000 | 0x0000000000B80000 | 0x00008000

[15:26:30] 0/ 8 | persist | 0x00038000 | 0x0000000000500000 | 0x00010000

[15:26:30] 0/ 9 | recovery | 0x00048000 | 0x0000000000C00000 | 0x0000D810

[15:26:30] 0/ 10 | rct | 0x00055810 | 0x0000000000080000 | 0x000027F0

[15:26:30] 0/ 11 | misc | 0x00058000 | 0x0000000000A00000 | 0x00008000

[15:26:30] 0/ 12 | laf | 0x00060000 | 0x0000000000F80000 | 0x00040000

[15:26:30] 0/ 13 | factory | 0x000A0000 | 0x0000000000D00000 | 0x00010000

[15:26:30] 0/ 14 | system | 0x000B0000 | 0x0000000008080000 | 0x00040508

[15:26:30] 0/ 15 | system | 0x000F0508 | 0x0000000007F80000 | 0x00040A70

[15:26:30] 0/ 16 | system | 0x00130F78 | 0x0000000007E80000 | 0x0003F590

[15:26:30] 0/ 17 | system | 0x00170508 | 0x0000000000080000 | 0x00000F78

[15:26:30] 0/ 18 | system | 0x00171480 | 0x0000000007D80000 | 0x0003FAF8

[15:26:30] 0/ 19 | system | 0x001B0F78 | 0x0000000007E80000 | 0x0003F590

[15:26:30] 0/ 20 | system | 0x001F0508 | 0x0000000000080000 | 0x00000F78

[15:26:30] 0/ 21 | system | 0x001F1480 | 0x0000000007D80000 | 0x0003FAF8

[15:26:30] 0/ 22 | system | 0x00230F78 | 0x0000000007E80000 | 0x0003F590

[15:26:30] 0/ 23 | system | 0x00270508 | 0x0000000000080000 | 0x00000F78

[15:26:30] 0/ 24 | system | 0x00271480 | 0x0000000007D80000 | 0x0003FAF8

[15:26:30] 0/ 25 | system | 0x002B0F78 | 0x0000000007E80000 | 0x0003F590

[15:26:30] 0/ 26 | system | 0x002F0508 | 0x0000000000080000 | 0x00000F78

[15:26:30] 0/ 27 | system | 0x002F1480 | 0x0000000007D80000 | 0x0003FAF8

[15:26:30] 0/ 28 | system | 0x00330F78 | 0x0000000007E80000 | 0x00040000

[15:26:30] 0/ 29 | system | 0x00370F78 | 0x0000000007E80000 | 0x00040000

[15:26:30] 0/ 30 | system | 0x003B0F78 | 0x0000000007E80000 | 0x00040000

[15:26:30] 0/ 31 | system | 0x003F0F78 | 0x0000000005C80000 | 0x0003F088

[15:26:30] 0/ 32 | system | 0x00430000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 33 | system | 0x00470000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 34 | system | 0x004B0000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 35 | system | 0x004F0000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 36 | system | 0x00530000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 37 | system | 0x00570000 | 0x0000000000080000 | 0x00010000

[15:26:30] 0/ 38 | cache | 0x00580000 | 0x0000000000F80000 | 0x00040000

[15:26:30] 0/ 39 | cache | 0x005C0000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 40 | cache | 0x00600000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 41 | cache | 0x00640000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 42 | cache | 0x00680000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 43 | cache | 0x006C0000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 44 | cache | 0x00700000 | 0x0000000000080000 | 0x00028000

[15:26:30] 0/ 45 | userdata | 0x00728000 | 0x0000000008080000 | 0x00041648

[15:26:30] 0/ 46 | userdata | 0x00769648 | 0x0000000000080000 | 0x00001000

[15:26:30] 0/ 47 | userdata | 0x0076A648 | 0x0000000007B80000 | 0x0003E9B8

[15:26:30] 0/ 48 | userdata | 0x007A9000 | 0x0000000007E00000 | 0x0003F000

[15:26:30] 0/ 49 | userdata | 0x007E8000 | 0x0000000000080000 | 0x00001648

[15:26:30] 0/ 50 | userdata | 0x007E9648 | 0x0000000000080000 | 0x00001000

[15:26:30] 0/ 51 | userdata | 0x007EA648 | 0x0000000007B80000 | 0x0003E9B8

[15:26:30] 0/ 52 | userdata | 0x00829000 | 0x0000000007E00000 | 0x0003F000

[15:26:30] 0/ 53 | userdata | 0x00868000 | 0x0000000000080000 | 0x00001648

[15:26:30] 0/ 54 | userdata | 0x00869648 | 0x0000000000080000 | 0x00001000

[15:26:30] 0/ 55 | userdata | 0x0086A648 | 0x0000000007B80000 | 0x0003E9B8

[15:26:30] 0/ 56 | userdata | 0x008A9000 | 0x0000000007E00000 | 0x0003F000

[15:26:30] 0/ 57 | userdata | 0x008E8000 | 0x0000000000080000 | 0x00001648

[15:26:30] 0/ 58 | userdata | 0x008E9648 | 0x0000000000080000 | 0x00001000

[15:26:30] 0/ 59 | userdata | 0x008EA648 | 0x0000000007000000 | 0x0003D9B8

[15:26:30] 0/ 60 | userdata | 0x00928000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 61 | userdata | 0x00968000 | 0x0000000000080000 | 0x00001648

[15:26:30] 0/ 62 | userdata | 0x00969648 | 0x0000000000080000 | 0x0003E9B8

[15:26:30] 0/ 63 | userdata | 0x009A8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 64 | userdata | 0x009E8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 65 | userdata | 0x00A28000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 66 | userdata | 0x00A68000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 67 | userdata | 0x00AA8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 68 | userdata | 0x00AE8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 69 | userdata | 0x00B28000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 70 | userdata | 0x00B68000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 71 | userdata | 0x00BA8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 72 | userdata | 0x00BE8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 73 | userdata | 0x00C28000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 74 | userdata | 0x00C68000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 75 | userdata | 0x00CA8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 76 | userdata | 0x00CE8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 77 | userdata | 0x00D28000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 78 | userdata | 0x00D68000 | 0x0000000000080000 | 0x00001648

[15:26:30] 0/ 79 | userdata | 0x00D69648 | 0x0000000000080000 | 0x0003E9B8

[15:26:30] 0/ 80 | userdata | 0x00DA8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 81 | userdata | 0x00DE8000 | 0x0000000000080000 | 0x00001648

[15:26:30] 0/ 82 | userdata | 0x00DE9648 | 0x0000000000080000 | 0x0003E9B8

[15:26:30] 0/ 83 | userdata | 0x00E28000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 84 | userdata | 0x00E68000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 85 | userdata | 0x00EA8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 86 | userdata | 0x00EE8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 87 | userdata | 0x00F28000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 88 | userdata | 0x00F68000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 89 | userdata | 0x00FA8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 90 | userdata | 0x00FE8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 91 | userdata | 0x01028000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 92 | userdata | 0x01068000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 93 | userdata | 0x010A8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 94 | userdata | 0x010E8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 95 | userdata | 0x01128000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 96 | userdata | 0x01168000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 97 | userdata | 0x011A8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 98 | userdata | 0x011E8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/ 99 | userdata | 0x01228000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/100 | userdata | 0x01268000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/101 | userdata | 0x012A8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/102 | userdata | 0x012E8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/103 | userdata | 0x01328000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/104 | userdata | 0x01368000 | 0x0000000000080000 | 0x00001648

[15:26:30] 0/105 | userdata | 0x01369648 | 0x0000000000080000 | 0x0003E9B8

[15:26:30] 0/106 | userdata | 0x013A8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/107 | userdata | 0x013E8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/108 | userdata | 0x01428000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/109 | userdata | 0x01468000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/110 | userdata | 0x014A8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/111 | userdata | 0x014E8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/112 | userdata | 0x01528000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/113 | userdata | 0x01568000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/114 | userdata | 0x015A8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/115 | userdata | 0x015E8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/116 | userdata | 0x01628000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/117 | userdata | 0x01668000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/118 | userdata | 0x016A8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/119 | userdata | 0x016E8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/120 | userdata | 0x01728000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/121 | userdata | 0x01768000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/122 | userdata | 0x017A8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/123 | userdata | 0x017E8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/124 | userdata | 0x01828000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/125 | userdata | 0x01868000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/126 | userdata | 0x018A8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/127 | userdata | 0x018E8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/128 | userdata | 0x01928000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/129 | userdata | 0x01968000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/130 | userdata | 0x019A8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/131 | userdata | 0x019E8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/132 | userdata | 0x01A28000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/133 | userdata | 0x01A68000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/134 | userdata | 0x01AA8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/135 | userdata | 0x01AE8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/136 | userdata | 0x01B28000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/137 | userdata | 0x01B68000 | 0x0000000000080000 | 0x00001648

[15:26:30] 0/138 | userdata | 0x01B69648 | 0x0000000000080000 | 0x0003E9B8

[15:26:30] 0/139 | userdata | 0x01BA8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/140 | userdata | 0x01BE8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/141 | userdata | 0x01C28000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/142 | userdata | 0x01C68000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/143 | userdata | 0x01CA8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/144 | userdata | 0x01CE8000 | 0x0000000000080000 | 0x00040000

[15:26:30] 0/145 | userdata | 0x01D28000 | 0x0000000000080000 | 0x00031C00

[15:26:30] 0/146 | BackupGPT | 0x01D59C00 | 0x0000000000080000 | 0x00000400

[15:26:30] CrossDL [D850] to [F400K]. SWversion[D855AT-00-V20p-GLOBAL-COM-MAY-08-2015-32G+0][15:26:30] ¡Ú¡Ú ERROR REASON : LAF_ERROR_INVALID_INPUT_FILE

[15:26:30] CComPort::ClosePort, Closed Port Successfully for COM 41

[15:26:30] CBasicComControl::Close, the port(COM41) is closed successfully

[15:26:30] [15:26:30] CrossDL [D850] to [F400K]. SWversion[D855AT-00-V20p-GLOBAL-COM-MAY-08-2015-32G+0]

[15:26:30] DoDownload() Exception

I am new to android custom roms, so i'm don't know what to do from here. :(

Thanks.