Can’t flash LG-X135 with Octopus

I need to flash LG-X135
What I did:
1. Pressed Write fw button
2. Disconnected phone’s battery
3. Connected cable to the phone
And nothing happens, no connection with the phone and no progress in writing fw…
I’ve been waiting for some time than press "Cancel" button

OS Win7x86 with latest updates

Drivers installed:

LGAndroidADBDriver
LGAndroidDriver_WHQL_ML_Ver_1.0_All_Win7
LGUnitedMobileDriver_S51MAN312AP22_ML_WHQL_Ver_3.1 2.3

And log file:

Checking data…OK
Platform: LG MTK
Selected port: COM3
Selected baudrate: 921600
Selected model: X135
Selected USB connection type
Please, disconnect battery and connect cable…Canceled!
Performed by 2.3.9 software version.

What should I do to fix this?