LGMK121S

Official firmware #16666 for K121S -LG X400

Home → LG X400 → LGK121S → K121S20A_00_0917.kdz
Download the latest versions of firmware for the LG X400, but don’t forget to look into whether the model number of your device corresponds to the indicated one K121S. The operating system version of the given firmware is Android 8.x Oreo Mirror Release 1, with build date 12.10.2018. The firmware code is SKT from REPUBLIC OF KOREA. Instruction how to flash stock firmware on LG phones here
  • File name K121S20A_00_0917
  • File size 1.61 GiB
  • Model LGMK121S
  • Operating system Android 8.x Oreo Mirror Release 1
  • Country Republic of Korea Republic of Korea
  • Region SKT
  • Description SK TELECOM
  • Hash 6a176da1b3b52f15a8a79b4c5e96f5fe

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Instructions

LG UP
  1. Download to your PC: LG UP 1.14 or LG UP 1.16.
  2. Next download and extract the KDZ firmware file.
  3. LG uses KDZ format when posting official firmware releases.
  4. Now turn off your device and enter Download mode.
  5. Press and hold the Volume Up key and then connect USB cable.
  6. Open LG UP next choose "Upgrade" and select your KDZ file(You can choose KDZ file here).
  7. Finally click on "Start" key. Your device will now reboot and disconnect from the PC.
LG Flash Tool 2014
  1. Download to your PC: LG Flash Tool 2014.
  2. Next download and extract the KDZ firmware file.
  3. LG uses KDZ format when posting official firmware releases.
  4. Now turn off your device and enter Download mode.
  5. Press and hold the Volume Up key and then connect USB cable.
  6. Open LG Flash Tool 2014 and select your KDZ file (You can choose KDZ file here), choose type "CDMA" then tap "CSE Flash".
  7. Next select "Different Country" and "English" language.
  8. Finally click on "OK". Your device will now reboot and disconnect from the PC.
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