Ok, I got it working again. problem was finding a good cab file, many appear to be damaged.
I have a fast PC and it converted the kdz file in under a minute.
was watching this video, and used the google drive link with ver9 for the 840vz9.
https://drive.google.com/drive/folders/0B6qm6EiEv6LSTjNUUVczU2h4M1k
I actually accidently downloaded and 870 cab and it was reading but failed, so I had been glad to see something was working, then after getting the right cab and saw it working was very glad.
Getting into download mode seems awful hard. I had to plug in USB on PC first, then phone, then real quick press volume UP and POWER BUTTON together. Pressing down both volume up and down with power did not work.
here is log. It rebooted the phone too during the install.
[R&D Test Tools Log File]
18:41:18 : Launching SW update
18:41:18 : Unpacking KDZ
18:41:25 : KDZ file extraced
18:41:28 : Files were extracted.
18:41:28 : LGMobileDL Load.
18:41:28 : Port = -1
18:41:28 : Connecting to phone
18:41:37 : Check Phone mode = 2
18:41:44 : Phone type check.......
18:41:44 : LGMobileDL.DLL Loading....
18:41:44 : _SetAuthMark Ok : wAuthMark(27649)
18:41:44 : _DetachDLL Call
18:41:44 : _DetachDLL Call End
18:41:44 : Param : Path = C:\ProgramData\LGMOBILEAX\Phone\VS840ZV9_05.S9_05.P58016.R5.wdb
18:41:44 : Param : moduleDir =
18:41:44 : Param : waitTime = 33000
18:41:44 : Param : UsbHighSpeed = 0
18:41:44 : Param : PhoneMode = 2
18:41:44 : Param : BinVersion = VS840ZV9_05.S9_05.P58016.R5
18:41:44 : Param : AuthMark = 27649
18:41:44 : Call fn_StartUpgrade
18:41:44 : CDMA: wParam = 20, lParam = 570
18:41:44 : Model Dll Msg Not Found(20, 570)
18:41:47 : CDMA: wParam = 13, lParam = 5
18:41:47 : Step : DSP Write
18:41:52 : CDMA: wParam = 13, lParam = 6
18:41:52 : Step : DSP Write
18:41:57 : CDMA: wParam = 13, lParam = 7
18:41:57 : Step : DSP Write
18:42:12 : CDMA: wParam = 20, lParam = 510
18:42:12 : Model Dll Msg Not Found(20, 510)
18:42:12 : CDMA: wParam = 13, lParam = 9
18:42:12 : Step : DSP Write
18:42:17 : CDMA: wParam = 13, lParam = 10
18:42:17 : Step : DSP Write
18:42:20 : CDMA: wParam = 13, lParam = 11
18:42:20 : Step : DSP Write
18:42:26 : CDMA: wParam = 13, lParam = 12
18:42:26 : Step : DSP Write
18:42:29 : CDMA: wParam = 13, lParam = 13
18:42:29 : Step : DSP Write
18:42:34 : CDMA: wParam = 13, lParam = 14
18:42:34 : Step : DSP Write
18:42:38 : CDMA: wParam = 13, lParam = 15
18:42:38 : Step : DSP Write
18:42:39 : CDMA: wParam = 13, lParam = 16
18:42:39 : Step : DSP Write
18:42:41 : CDMA: wParam = 13, lParam = 17
18:42:41 : Step : DSP Write
18:42:45 : CDMA: wParam = 13, lParam = 18
18:42:45 : Step : DSP Write
18:42:50 : CDMA: wParam = 13, lParam = 19
18:42:50 : Step : DSP Write
18:42:54 : CDMA: wParam = 13, lParam = 20
18:42:54 : Step : DSP Write
18:42:58 : CDMA: wParam = 13, lParam = 21
18:42:58 : Step : DSP Write
18:43:01 : CDMA: wParam = 13, lParam = 22
18:43:01 : Step : DSP Write
18:43:05 : CDMA: wParam = 13, lParam = 23
18:43:05 : Step : DSP Write
18:43:08 : CDMA: wParam = 13, lParam = 24
18:43:08 : Step : DSP Write
18:43:13 : CDMA: wParam = 13, lParam = 25
18:43:13 : Step : DSP Write
18:43:17 : CDMA: wParam = 13, lParam = 26
18:43:17 : Step : DSP Write
18:43:21 : CDMA: wParam = 13, lParam = 27
18:43:21 : Step : DSP Write
18:43:25 : CDMA: wParam = 13, lParam = 28
18:43:25 : Step : DSP Write
18:43:29 : CDMA: wParam = 13, lParam = 29
18:43:29 : Step : DSP Write
18:43:29 : CDMA: wParam = 20, lParam = 432
18:43:29 : Model Dll Msg Not Found(20, 432)
18:43:33 : CDMA: wParam = 13, lParam = 30
18:43:33 : Step : DSP Write
18:43:37 : CDMA: wParam = 13, lParam = 31
18:43:37 : Step : DSP Write
18:43:41 : CDMA: wParam = 13, lParam = 32
18:43:41 : Step : DSP Write
18:43:46 : CDMA: wParam = 13, lParam = 33
18:43:46 : Step : DSP Write
18:43:49 : CDMA: wParam = 13, lParam = 34
18:43:49 : Step : DSP Write
18:43:53 : CDMA: wParam = 13, lParam = 35
18:43:53 : Step : DSP Write
18:43:57 : CDMA: wParam = 13, lParam = 36
18:43:57 : Step : DSP Write
18:44:00 : CDMA: wParam = 13, lParam = 37
18:44:00 : Step : DSP Write
18:44:05 : CDMA: wParam = 13, lParam = 38
18:44:05 : Step : DSP Write
18:44:10 : CDMA: wParam = 13, lParam = 39
18:44:10 : Step : DSP Write
18:44:15 : CDMA: wParam = 13, lParam = 40
18:44:15 : Step : DSP Write
18:44:19 : CDMA: wParam = 13, lParam = 41
18:44:19 : Step : DSP Write
18:44:24 : CDMA: wParam = 13, lParam = 42
18:44:24 : Step : DSP Write
18:44:29 : CDMA: wParam = 13, lParam = 43
18:44:29 : Step : DSP Write
18:44:34 : CDMA: wParam = 13, lParam = 44
18:44:34 : Step : DSP Write
18:44:37 : CDMA: wParam = 13, lParam = 45
18:44:37 : Step : DSP Write
18:44:41 : CDMA: wParam = 13, lParam = 46
18:44:41 : Step : DSP Write
18:44:45 : CDMA: wParam = 13, lParam = 47
18:44:45 : Step : DSP Write
18:44:49 : CDMA: wParam = 13, lParam = 48
18:44:49 : Step : DSP Write
18:44:53 : CDMA: wParam = 13, lParam = 49
18:44:53 : Step : DSP Write
18:44:53 : CDMA: wParam = 20, lParam = 324
18:44:53 : Model Dll Msg Not Found(20, 324)
18:44:57 : CDMA: wParam = 13, lParam = 50
18:44:57 : Step : DSP Write
18:45:01 : CDMA: wParam = 13, lParam = 51
18:45:01 : Step : DSP Write
18:45:06 : CDMA: wParam = 13, lParam = 52
18:45:06 : Step : DSP Write
18:45:10 : CDMA: wParam = 13, lParam = 53
18:45:10 : Step : DSP Write
18:45:14 : CDMA: wParam = 13, lParam = 54
18:45:14 : Step : DSP Write
18:45:16 : CDMA: wParam = 13, lParam = 55
18:45:16 : Step : DSP Write
18:45:20 : CDMA: wParam = 13, lParam = 56
18:45:20 : Step : DSP Write
18:45:23 : CDMA: wParam = 13, lParam = 57
18:45:23 : Step : DSP Write
18:45:26 : CDMA: wParam = 13, lParam = 58
18:45:26 : Step : DSP Write
18:45:30 : CDMA: wParam = 13, lParam = 59
18:45:30 : Step : DSP Write
18:45:34 : CDMA: wParam = 13, lParam = 60
18:45:34 : Step : DSP Write
18:45:38 : CDMA: wParam = 13, lParam = 61
18:45:38 : Step : DSP Write
18:45:41 : CDMA: wParam = 13, lParam = 62
18:45:41 : Step : DSP Write
18:45:45 : CDMA: wParam = 13, lParam = 63
18:45:45 : Step : DSP Write
18:45:48 : CDMA: wParam = 13, lParam = 64
18:45:48 : Step : DSP Write
18:45:51 : CDMA: wParam = 13, lParam = 65
18:45:51 : Step : DSP Write
18:45:54 : CDMA: wParam = 13, lParam = 66
18:45:54 : Step : DSP Write
18:45:58 : CDMA: wParam = 13, lParam = 67
18:45:58 : Step : DSP Write
18:46:02 : CDMA: wParam = 13, lParam = 68
18:46:02 : Step : DSP Write
18:46:05 : CDMA: wParam = 13, lParam = 69
18:46:05 : Step : DSP Write
18:46:05 : CDMA: wParam = 20, lParam = 216
18:46:05 : Model Dll Msg Not Found(20, 216)
18:46:08 : CDMA: wParam = 13, lParam = 70
18:46:08 : Step : DSP Write
18:46:11 : CDMA: wParam = 13, lParam = 71
18:46:11 : Step : DSP Write
18:46:14 : CDMA: wParam = 13, lParam = 72
18:46:14 : Step : DSP Write
18:46:17 : CDMA: wParam = 13, lParam = 73
18:46:17 : Step : DSP Write
18:46:21 : CDMA: wParam = 13, lParam = 74
18:46:21 : Step : DSP Write
18:46:24 : CDMA: wParam = 13, lParam = 75
18:46:24 : Step : DSP Write
18:46:28 : CDMA: wParam = 13, lParam = 76
18:46:28 : Step : DSP Write
18:46:32 : CDMA: wParam = 13, lParam = 77
18:46:32 : Step : DSP Write
18:46:36 : CDMA: wParam = 13, lParam = 78
18:46:36 : Step : DSP Write
18:46:41 : CDMA: wParam = 13, lParam = 79
18:46:41 : Step : DSP Write
18:46:46 : CDMA: wParam = 13, lParam = 80
18:46:46 : Step : DSP Write
18:46:51 : CDMA: wParam = 13, lParam = 81
18:46:51 : Step : DSP Write
18:46:55 : CDMA: wParam = 13, lParam = 82
18:46:55 : Step : DSP Write
18:46:59 : CDMA: wParam = 13, lParam = 83
18:46:59 : Step : DSP Write
18:47:02 : CDMA: wParam = 13, lParam = 84
18:47:02 : Step : DSP Write
18:47:06 : CDMA: wParam = 13, lParam = 85
18:47:06 : Step : DSP Write
18:47:11 : CDMA: wParam = 13, lParam = 86
18:47:11 : Step : DSP Write
18:47:15 : CDMA: wParam = 13, lParam = 87
18:47:15 : Step : DSP Write
18:47:19 : CDMA: wParam = 13, lParam = 88
18:47:19 : Step : DSP Write
18:47:23 : CDMA: wParam = 13, lParam = 89
18:47:23 : Step : DSP Write
18:47:23 : CDMA: wParam = 20, lParam = 108
18:47:23 : Model Dll Msg Not Found(20, 108)
18:47:26 : CDMA: wParam = 13, lParam = 90
18:47:26 : Step : DSP Write
18:47:26 : CDMA: wParam = 13, lParam = 91
18:47:26 : Step : DSP Write
18:47:27 : CDMA: wParam = 13, lParam = 92
18:47:27 : Step : DSP Write
18:47:28 : CDMA: wParam = 13, lParam = 93
18:47:28 : Step : DSP Write
18:47:29 : CDMA: wParam = 13, lParam = 94
18:47:29 : Step : DSP Write
18:47:29 : CDMA: wParam = 20, lParam = 70
18:47:29 : Model Dll Msg Not Found(20, 70)
18:47:29 : CDMA: wParam = 13, lParam = 94
18:47:29 : Step : DSP Write
18:47:39 : CDMA: wParam = 13, lParam = 95
18:47:39 : Step : DSP Write
18:47:49 : CDMA: wParam = 13, lParam = 96
18:47:49 : Step : DSP Write
18:47:59 : CDMA: wParam = 13, lParam = 97
18:47:59 : Step : DSP Write
18:48:09 : CDMA: wParam = 13, lParam = 98
18:48:09 : Step : DSP Write
18:48:19 : CDMA: wParam = 13, lParam = 99
18:48:19 : Step : DSP Write
18:48:29 : CDMA: wParam = 13, lParam = 100
18:48:29 : Step : DSP Write
18:48:29 : CDMA: wParam = 12, lParam = 1
18:48:29 : Step : UPDATE FINISHED!
18:48:29 : ResetStartInfo() Call
18:48:29 : _DetachDLL Call
18:48:29 : _DetachDLL Call End
18:48:29 : FreeLibrary Call
18:48:31 : FreeLibrary Call End
18:48:31 : ResetStartInfo() Call End
18:48:31 : OnModelDllMsg(OnMsgFromModelDll-CDMA) delete m_pLGCyonUpdate
18:48:31 : ===FINISHED===