Back from cm11 to stock

Hi
I would like to back from cm 11 to stock and i wonder is it possible to restore backup (i've got copy on pc) which i've made in cwm before flashing cm11? I know that i can flash clean stock by LG KDZ Updater or LGMobile Support Tool but it's take too much time.

ok i will instal from kdz, but can i use kdz different then originl kdz from my serial number? I have a phone from orange with original soft 10F which is downloading by Org LG Firmware but i also have soft 10g and 10H europa open. Is it possible to instal one of them by kdz udpater? I know the way to instal it but first the phone must have soft from orange

i have some problem. I turn phone into download mode, start kdz updater set everything from tutorial, launch software update and then i see that:

[R&D Test Tools Log File]

18:29:23 : Launching SW update
18:29:23 : Unpacking KDZ
18:29:29 : KDZ file extraced
18:29:38 : Files were extracted.
18:29:38 : LGMobileDL Load.
18:29:38 : Port = -1
18:29:38 : Connecting to phone
18:29:50 : Check Phone mode = 2
18:29:50 : Phone type check.......
18:29:51 : LGMobileDL.DLL Loading....
18:29:51 : _SetAuthMark Fail
18:29:51 : _SetAuthMark Ok : wAuthMark(65535)
18:29:51 : _DetachDLL Call
18:29:51 : _DetachDLL Call End
18:29:51 : Param : Path = C:\ProgramData\LGMOBILEAX\Phone\E97510F_00.dz
18:29:51 : Param : moduleDir =
18:29:51 : Param : waitTime = 0
18:29:51 : Param : UsbHighSpeed = 1
18:29:51 : Param : PhoneMode = 2
18:29:51 : Param : BinVersion = E97510F_00
18:29:51 : Param : AuthMark = 65535
18:29:51 : Call fn_StartUpgrade
18:32:47 : 3GQCT : wParam = 100, lParam = 210
18:32:47 : Step : Upgrade Error error code = 210
18:32:47 : ResetStartInfo() Call
18:32:47 : _DetachDLL Call
18:32:47 : _DetachDLL Call End
18:32:47 : FreeLibrary Call
18:32:47 : FreeLibrary Call End
18:32:47 : ResetStartInfo() Call End
18:32:48 : ===FINISHED===

and phone switch to fastboot mode

What i do wrong?

it was like you said. Thanks for a help