Lg f220k Problem

Boot repair with riif success .. but when i try to flash through octopus or flash tool some time flash Done but phone restart .. some time error … when i try to get info in octopus … always show
SW version: LGF220KAT-00-V20d-KT-KR-SEP-09-2015+0

Even i flash with 10D or 30B ..
i not found 20D frimware anywhere .. how to solve this problem