The LG K series is a line of Android smartphones designed and produced by LG Electronics, Inc. LG is a South Korean electronics company that sells devices worldwide. LG produces consumer electronics as well as home appliances. The K Series launched in January 2016 with the K10, K7, and K4. The K8 was released in February 2016 and the K3 debuted Hello. In order to test a custom recovery for LG K420n I have to enter fastboot mode and then use the "fastboot oem unlock" command to unlock bootloader. The problem is I cannot enter fastboot mode. I tried all the possible commands and button 2. Use the producer's charger Usually the charger which you are given together with the device charges your phone the quickest. Charging by USB cable may be universal but they use less than 1 amper and the modern devices usually need 2 ampers or more. How to enter LG K10 (2017) Also known as LG X400, LG M250N Recovery Mode, Hard reset / Wipe and Remove forgotten unlock Pattern. Recovery Mode LG K10 (2017) Turn off the device Press and hold Volume down key and Power Key for a few seconds Release Power key only when LG Logo appears Keep • Read More » VKazu7.