Question: how to flash lg k20?
Answer: STEP 1: Installing the LG K20 USB Driver. Before connecting your phone, install the downloaded LG Mobile Driver v4. ... 
STEP 2: Booting K20 into Download Mode. ... 
STEP 3: Loading the LGUP Flashing Tool. ... 
STEP 4: Flashing LG K20 Stock Firmware using LGUP.