Step 1 :
Download AvatarROM buid 2.16b ROM on Optimus Black p 970 and Google apps.
Step 2 :
Now, use a USB cable to connect your optimus Black p970 to the PC and mount your storage.
Step 3 :
If you can access your phone’s SD card content from your PC, copy the downloaded zip files and paste them into your phone’s SD card (Warning : Do not extract any files).