Tips and tricks to fix SAMSUNG GALAXY J4 problems. Yes this is dual simcard smartphone which can work maximum 4G LTE Internet broadband. Entry level smartphone with cheap price. It is use Exynos 7570 Quad processor and already use Android Oreo 8.0 as factory default operating system. SAMSUNG GALAXY J4 already use Super AMOLED for more better color display if compare with standard LCD. The other interesting features at this phone are front camera with LED flash light and also removable battery. Find more review and information how to solve troubles of SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) at


What is Advantage of SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) Specifications:

GSM 3G HSDPA with 4G LTE, Dual Simcard
LCD 5.5 inches with Super AMOLED
Internal memory 16 GB with 2 GB RAM
External memory microSD maximum 256 GB
Main Camera 13 MP, f/1.9, autofocus, LED flash
Front Camera 5 MP, f/2.2 with LED light flash for video conference & selfie photography
Processor Quad-core 1.4 GHz Cortex-A53
Operating system Android Oreo version 8.0
Battery Li-Ion 3000 mAh



How to Fix or Problem Solving for Recovery SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) hang or not responding or malfunctions or stuck or freezing or bricked ?

Samsung have their own processor with Exynos 7570 Quad, it can run with Quad-core 1.4 GHz Cortex-A53 and also have dedicated GPU Mali-T720 MP2 for run some HD Games. The internal memory is 16 GB, we have almost half free capacity to install several other applications from Google Play Store like WeChat, Whatsapp, Facebook, Line Messenger, Skype, Telegram, Instagram, Viber, Snapchat, Blackberry Messenger (BBM). Why we are not getting full 16 GB storage? because some of them use for keep operating system file source and also some factory default applications which can not removed manually. Back again to Google Play Store, we have to read carefully some review when we want to install new or not famous apps, because they may contain viruses or malware that can make troubles at our SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) like stuck or bricks or hang or bootloop or frozen or LCD touch screen not responsive or LCD screen not responding with our finger touch. Bad apps will not get Verified by Play Protect information when we download from Play Store.

What do we have to do? First we have to try do soft reset or reboot or restart to remove temporary files or caches that can make some trouble at this phone. If our SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) can boot again, then please directly download one good antivirus applications from Google Play Store like AVAST or NORTON, please choose only one antivirus we like. The antivirus will try to scan all installed applications and give recommendation setting to our phone. 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 SAMSUNG GALAXY J4 (J400F/DS & J400G/DS). For safety reasons, please do not install any unknown APK files, because they are very easy to make our phone getting trouble.


How to Force Shutdown or Force Soft Reset or Reboot or Restart SAMSUNG GALAXY J4 (J400F/DS & J400G/DS)?

Because we have installed many applications, then sometime they may crash or corrupt. It can make some trouble at our SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) like hang or performance drop or some other troubles like LCD touch screen not responsive. We need to try restart or reboot to clean temporary files and caches inside SAMSUNG GALAXY J4 (J400F/DS & J400G/DS). Please press and hold POWER button until SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) shutdown or turn off by itself. You may also try press and hold POWER + VOLUME DOWN button to shut it down. After it is 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 SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) 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 SAMSUNG GALAXY J4 (J400F/DS & J400G/DS)?


We can use microSD external card to copy or move important files using File Manager applications. If our SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) 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.


#Option 1, How to Hard Reset SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) with software menu:

  1. Turn on this phone
  2. Make sure SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) battery already charge properly
  3. Go to menu: Setting > General tab > Backup & Reset > Factory data reset > Reset device
  4. Choose Erase Everything
  5. SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) will do the process to Master Reset to Factory Default


hard reset samsung galaxy j4 (j400f / j400g)

#Option 2, How to Hard Reset SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) with Hardware key button:

  1. Make sure the battery of SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) charge properly or battery have more then 50% capacity
  2. Turn off SAMSUNG GALAXY J4 (J400F/DS & J400G/DS)
  3. Press and hold together : Power Button + Volume Up + Home Button 
  4. If the button at number 3 not work, we can try with press and hold together Power Button + Volume Up Button
  5. If we see the menu at LCD screen, choose Wipe Data/Factory Reset with Volume Button to select and use Power Button to ok or enter.
  6. The SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) will do the process of restoring to factory default.


How to Unlock or Fix or Bypass or Solutions for SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) forgot password code or security lock screen pattern or pin (lost password)?

SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) does not have fingerprint for security protections, because this is cheap smartphone. However, we have to give security protections to secure our important data or private pictures from 13 megapixel main camera or 5 megapixel front camera. We have to protect our data from unauthorized people when SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) away from us or lost or stolen. We recommended to give screen lock pattern or password pin protections to secure our phone. The problems will be happen when we forgot security answer or fingerprint can not unlock the screen protections, what should we do?

Do not worry because we can unlock or bypass forgotten screen lock pattern or password pin protections at SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) use registered Google account. Please turn ON our phone, when it ask for security answer, please give several time wrong answer continuously until our SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) freezing or locked 30 seconds, at this time we can find Forgot Password / Pattern button, press this button to unlock using Gmail account that we have already sign-in before. If we can not access our Google account, then we have to do hard reset using hardware button combination key




This is the way to help for unlock or bypass forgotten security protection at SAMSUNG GALAXY J4 (J400F/DS & J400G/DS). Although we are sure about our security protection, but sometime we may forget about the right answer. Please note, when we give security protection at our SAMSUNG GALAXY J4 (J400F/DS & J400G/DS), it also give step to put our own PIN / PASSWORD as BACKUP PASSWORD / PIN. This backup PIN use to bypass or unlock forgotten security code later. Use above steps to unlock forgot password or screen lock pattern security protection using Google account or Gmail username and password.


Is That Any Secret Code for Doing Format SAMSUNG GALAXY J4 (J400F/DS & J400G/DS)?

We can try to use secret code for doing hard reset SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) is *2767*3855#. But please remember to always be careful typing that code, because the SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) will do hard reset and remove all data also installed applications.


How to Format or Erase Phone Memory at SAMSUNG GALAXY J4 (J400F/DS & J400G/DS)?

There are two phone memory type at SAMSUNG GALAXY J4 (J400F/DS & J400G/DS), 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 SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) 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 SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) Stronger, Life Longer and Not Fast to Drain ?

The battery of SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) use 3000 mAh capacity. It is already good enough to make this phone run full one day without need to recharge. For some heavy user which play to much at their smartphone or have many social media group chat, then maybe this battery is not enough. We suggest to have battery backup because SAMSUNG GALAXY J4 (J400F/DS & J400G/DS) battery is removable, then we can replace anytime we want with alternative battery. If we do not have battery backup but we want to use this phone more longer then please do some adjustment like make LCD screen brightness as low as possible, we also have to disable all not use connections like GPS or Wifi or Bluetooth. If some apps need to know our locations like camera apps, then please activate GPS battery saving mode. Please also uninstall some not use applications, because some of them may standby at memory to wait data update and it will also consume battery.


Latest Discussions & Share Information:

[Q] Please remove the virus from my phone
[A] Hi, please follow steps at install and scan with safe antivirus applications for Android