Tips and tricks to fix LG K31 problems. This is entry level smartphone with product code model: LM-K300Q & LMK300. It does not have 5G connection, but we can use 4G LTE for fast Internet access. The screen size is 5.7 inches with HD resolutions at 720 x 1520 pixels. We can see small notch at top screen for 5 megapixel front camera.

Android 10.0 is factory default operating system and work with LG UX 9.1 user interface. LG K31 powered by Mediatek processor MT6762 Helio P22 together with dedicated GPU (graphic processor unit) PowerVR GE8320 for graphic rendering. Some users get issue with LG K31 software or hardware, therefore we will try to give more review and information about how to solve LG K31 troubles at community.


What is Advantage of LG K31 Specifications and Features?

  • Network GSM 3G HSDPA or 4G LTE
  • LCD 5.7 inches
  • Processor Mediatek MT6762 Helio P22
  • GPU PowerVR GE8320
  • Bluetooth / GPS / Wifi
  • Memory Internal 32 GB
  • RAM 2 GB
  • External memory Slot MicroSD
  • Main Camera Triple 13 MP + 5 MP
  • Main Camera Features autofocus & LED flash
  • Front Camera 5 MP for video conference and selfie photography
  • Operating System Android 10.0
  • Battery Li-Po 3000 mAh



How to Fix or Problem Solving for Recovery LG K31 hang or not responding or malfunctions or stuck or freezing or bricked ?

As cheap low end smartphone, LG K31 only has 2 GB RAM and 32 GB internal memory. We suggest to add more storage with MicroSD / MicroSDXC either 16 GB / 32 GB or more for keep photos videos and some data of installed applications. We can choose several important applications from Google Play Store.

Because the storage is not to big, then please do not install too many applications. Especially for new or not famous applications, they may contain viruses or malware that make our LG K31 become slowly or hang or stuck or frozen or bricks or LCD touch screen not responsive. Please read many user reviews before install any applications. These bad apps will not get any Verified by Play Protect information at downloaded process. Please note, usually Editor choice is good options to try for safety reasons.

What do we have to do when we get this trouble? First we have to remove temporary files and caches inside this phone by doing soft reset. After our LG K31 can run again, then please try to download one good antivirus like NORTON or AVAST. It will scan all installed applications and give recommendation if there are some high-risk setting. If the problems still happen, then next steps is doing hard reset or master format.

Please note, doing hard reset will remove or erase all important data, therefore we have to backup all data first before doing master format. Doing hard reset will remove all Google account from LG K31. For safety reasons, please do not install any unknown APK files, because it is very easy to make our phone getting trouble.


How to Force Shutdown or Force Soft Reset or Reboot or Restart LG K31 ?

LG K31 only has 2 GB RAM. It is very limited, therefore some installed apps may crash or corrupt when running at our phone. It can make our phone become hang or LCD touch screen not responding with finger touch. We need to force remove temporary files and caches inside this phone. Please press and hold POWER button until LG K31 shutdown or turn off by itself. If it is not work, then try to press and hold POWER + VOLUME DOWN together until shutdown.


After it totally off, then we can press again POWER button to turn it ON. This process will not remove any important data, therefore we can do this process anytime we want. If our LG K31 still can work properly, but we want to clear temporary files and caches from some applications, then please press and hold POWER button until pop-up menu appear, continue choose Shutdown / Power off / Reboot menu.


How to backup data or Contact at LG K31 ?

We can use microSD external card to copy or move important files using File Manager applications. If our LG K31 has already signed in with Google account, by default our contact will be synchronize in the background to Google server. Please make sure we check all contact at Google contact server using Internet browse to make sure backup is done.


Please note: These options bellow may not work for some devices because of firmware update version or hardware troubles or some other possibilities.

#Option 1, Hard Reset LG K31 with software menu

  1. Turn on the LG K31
  2. Make sure the battery is not empty
  3. Backup important data at LG K31 because all data and applications will be erase or delete
  4. Go to Menu :  Setting > Backup and Reset > Factory Data Reset
  5. Choose : Reset Device > Delete all
  6. The LG K31 will do the master reset process.


hard reset lg k31

#Option 2, Hard Reset LG K31 Factory Default using Hardware Secret Button Key


In some conditions, we can not do anything at LG K31 touch screen or frozen in some state. So we can not access reset menu like Option #1, do not worry, because we can do hard reset LG K31 with hardware key button:

  1. Turn off the LG K31
  2. Make sure the battery LG K31 already full or more than 50%
  3. Press together and hold the Power Button + Volume Down Button
  4. If the Logo appear, then release the Power Button (do not release the Volume Down Button), then continue to press again the Power Button until Recovery mode / Factory reset menu appear, then we can release all button now.
  5. Choose wipe data/factory reset using Volume Button, and press Power Button to Enter or OK
  6. The LG K31 will continue master reset, wait for several minutes until the phone start like new again.


How to Unlock or Fix or Bypass or Solutions for LG K31 forgot password code or security lock screen pattern or pin (lost password)?

Some installed applications may keep many private data. After use several months, our LG K31 will get some important data and photos videos which taken from dual rear camera or single front camera. We need to secure all confidential data from unauthorized users when LG K31 stolen or lost or away from us.

Fingerprint sensor is recommended to activate. We need to choose secondary protections for backup and activate when LG K31 just performing soft reset or reboot. The problems will be happen when we forgot security answer or fingerprint can not recognize for unlock, what should we do?

Do not worry because we can unlock or bypass forgotten screen lock pattern or password pin protections at LG K31 use registered Google account. We have to force hard reset or master format using hardware button combination key like steps at #option 2 above.

After finish hard reset, this phone will ask for Verify your account with previous Google Account that has been used before performing hard reset. Please note that Google account is very important. This phone already use latest version of Android operating system, therefore LG K31 implement FRP (factory reset protection) to make our phone safe from hard reset when stolen or lost.


Is That Any Secret Code for Doing Format LG K31?

There is no secret hidden code for LG K31 to make it back to factory default. Do the options above to hard reset it.


How to Format or Erase Phone Memory at LG K31 ?

There are two phone memory type at LG K31 , one is internal memory and the other one is external memory. If we want to format internal memory phone then we have to do hard reset or reformat the operating system of LG K31 as well. Please use menu setting to do hard reset or reformat using #option 1 above, but make sure to give checkbox mark at Erase Internal SD card / Internal storage. Then it will reformat the factory default operating system and remove or erase any data inside internal memory.

To reformat or wipe or erase all data at external memory, we can use menu Setting > Storage > Erase Internal Storage / SD Card. Please always make sure all data has already backup before reformat or wipe everything, because it is hard to recover formatted / wiped data at internal or external storage.


How to Make Battery of LG K31 Stronger, Life Longer and Not Fast to Drain ?

LG K31 (LM-K300Q / LMK300) has 3000 mAh. It is not too big bug enough to make it work one day at standard activity. If we want to make LG K31 battery work more longer, then please do some adjustment like make LCD screen not too bright and disable all not use connections like GPS or Bluetooth or Wifi. NFC is not installed at LG K31.