You can generally find three types of firmware for this device:
LG Optimus L7 II Dual (P715) is a legacy device, and while official support has largely ended, there are still resources available for downloading and installing firmware. Firmware Options for proshivki dlia lg p715 skachat
: Offers a database where you can sometimes find direct links to Official LG Stock Firmware based on your region. You can generally find three types of firmware