I had this exact same issue when upgrading my phone. Didn't do it correctly and it took me about 3 hours before I got my phone working again. It was about a week ago on another computer, but I'll try to recall what I did when it finally clicked in my mind.

Download H81120i_00_0201.kdz flashable zip from here (1.6GB Feb-04-16):

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عضویت

Download LGUP and install it. I used the DropBox link in this thread:

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عضویت

Remember to install the LGUP_8994_DLL file BEFORE LGUP_Install

Download and install LG Bridge (for the USB drivers) here:

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عضویت

Select the LG 815 model, the drivers will work. I only used the LG Bridge to install the USB drivers. Nothing else.

OK, now here's where your phone comes in.
Step 1: Turn off your phone (pull the battery if you must, but put it back in).

Step 2: Hold the VOLUME UP button and plug the USB cable into your PC. This puts your phone into DOWNLOAD MODE.

Step 3: On your PC, open up LGUP. The program shoud recognize the phone as H811 in COM3 or COM4. Highlight it and click the SELECT button.

Step 4: Under the "Process" row, select UPGRADE

Step 5: Click the blank space under File Path, it will pop up a [...] [X] at the end. Click the [...].

Step 6: Select the H81120i_00_0201.kdz and click on Start. The program will push the STOCK H811 MM ROM to your phone. This will bring your phone out of Brick mode, but you will have to go through the entire rooting process again.

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