Overview LG K121K(LGMK121K) aka LG X400

Specification LG K121K(LGMK121K) aka LG X400

Model and Features
Model LG K121K
Series LG X400
Release Date February, 2017
Depth 7.9 mm ( 0.31 in)
Size (width x height) 148.7 x 75.3 mm (5.85 x 2.96 in)
Weight 144 g (5.08 oz)
Operating System Android 7.x Nougat
Hardware
CPU 1.5 GHz Cortex-A53, Mediatek MT6750
CPU Cores Octa-core
RAM Memory 2GB
Internal Storage 16GB
External Storage microSD, up to 64 GB
Network and Data
Number of sim slots 1 Nano-SIM
2G network GSM 850/900/1800/1900 MHz
3G network HSDPA 850/900/1900/2100 MHz
4G network LTE 800, 850, 900, 1800, 2100, 2600 MHz
5G network
Data GPRS/EDGE
Display
Screen size 5.3 in, 77.4 cm2 (~69.2% screen-to-body ratio)
Display Type IPS LCD capacitive touchscreen
Display Resolution 720 x 1280 pixels 16:9 ratio (~277 ppi density)
Display Colors 16M colors
Battery and Keyboard
Battery Capacity Removable Li-Ion 2800 mAh
Physical keyboard
Interfaces
Audio output 3.5mm jack
Bluetooth version 4.2, A2DP
DLNA No
GPS Yes, with A-GPS, GLONASS
Infrared port No
NFC Yes
USB microUSB 2.0 , USB On-The-Go
WiFi Wi-Fi802.11b/g/n, Wi-Fi Direct, hotspot

Firmwares LG K121K(LGMK121K) aka LG X400

LG Phone firmwares regions descriptions
Region File name OS Size Date Downloads
KTF
  • Republic of Korea
K121K10Y_00_0219.kdz Android 7.x Nougat 1.77 GiB 2018-03-15 129 time(s)
KTF
  • Republic of Korea
K121K20A_00_0917.kdz Android 8.x Oreo Mirror Release 1 1.64 GiB 2018-10-18 64 time(s)
KTF
  • Republic of Korea
K121K20E_00_0212.kdz Android 8.x Oreo Mirror Release 1 1.67 GiB 2019-03-21 54 time(s)

Manual LG K121K(LGMK121K) aka LG X400

How to Factory Reset through menu on LG K121K(LGMK121K) aka LG X400 ?

  1. Open the Main Menu.
  2. Go to "Settings".
  3. In Settings choose "General".

  4. In General select "Backup & Reset".

  5. Next, clik on "Reset Phone".

  6. Confirm by clicking  "Erase Everything".

  7. Finally, press "OK".

  8. The hard reset is completed now. 
  9. As a result of these actions, the memory of your phone can not be restored.

How to Hard Reset on LG K121K(LGMK121K) aka LG X400 ?


Type 1:

 

Type 2:

 

Type 3:

 

  1. Turn off the phone.
  2. Next press and hold the Power key and Volume down key for ten seconds.
  3. Release the power key while holding down the volume key.
  4. Next press the power button again.
  5. After these actions, the Factory Reset menu will appear on the screen.

    Type 1:

    Type 2:

  6. Use the Power key and Volume key to confirm the process.
  7. The hard reset is completed now.
  8. As a result of these actions, the memory of your phone cannot be restored.

How to Factory Reset through code on LG K121K(LGMK121K) aka LG X400 ?

  1. Turn on the phone.
  2. Open phone's Dialer.
  3. Enter one of the proposed codes:  3845#*121# or 277634#*# or *#546368#*121#.

  4. Confirm your actions by open "SVC Menu" or "Hidden Menu".

  5. Then select  " Factory Reset " (R&D Only).

  6. Finally press "OK".

  7. The hard reset is completed now. 
  8. As a result of these actions, the memory of your phone cannot be restored.

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