Samsung SM-G390FZKAILO manual Forcing restart, Resetting the device

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Appendix

The touchscreen responds slowly or improperly

If you attach a screen protector or optional accessories to the touchscreen, the touchscreen may not function properly.

If you are wearing gloves, if your hands are not clean while touching the touchscreen, or if you tap the screen with sharp objects or your fingertips, the touchscreen may malfunction.

The touchscreen may malfunction in humid conditions or when exposed to water.

Restart your device to clear any temporary software bugs.

Ensure that your device software is updated to the latest version.

If the touchscreen is scratched or damaged, visit a Samsung Service Centre.

Your device freezes or encounters a fatal error

Try the following solutions. If the problem is still not resolved, contact a Samsung Service Centre.

Restarting the device

If your device freezes or hangs, you may need to close apps or turn off the device and turn it on again.

Forcing restart

If your device is frozen and unresponsive, press and hold the Power key and the Volume Down key simultaneously for more than 7 seconds to restart it.

Resetting the device

If the methods above do not solve your problem, perform a factory data reset.

On the Apps screen, tap Settings General management Reset Factory data reset

RESET DELETE ALL. Before performing the factory data reset, remember to make backup copies of all important data stored in the device.

If you registered a Google account to the device, you must sign in to the same Google account after resetting the device.

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Contents SM-G390F SM-G390Y Table of Contents Appendix Read me first BasicsInstructional icons Device overheating situations and solutionsWhen the device heats up while charging the battery Do the following when the device heats upWhen the device heats up during use Precautions for operating environment Device limitations when the device overheatsMaintaining water and dust resistance Package contents Device layout Recents KeysInstalling the battery BatteryRemoving the battery Charging the battery Viewing the estimated charging time Battery charging tips and precautionsReducing the battery consumption Maximum power saving mode Power saving modeSIM or Usim card microSIM card Installing the SIM or Usim cardRemoving the SIM or Usim card Installing a memory cardMemory card microSD card Removing the memory card Formatting the memory card Attaching a hand strapRestarting the device Turning the device on and offControlling the touchscreen Dragging TappingTapping and holding Spreading and pinching Double-tappingSwiping Home screen Home screenAdding items Home screen optionsCreating folders Moving itemsRemoving items Managing panels Using quick optionsApps screen Rearranging items Searching for items Indicator iconsLock screen Notification panel Using the notification panelUsing quick setting buttons Finder Searching for content or nearby devicesSetting search categories Entering textChanging the keyboard layout Additional keyboard functionsChanging the input language Capturing a screenshot Screen captureOpening apps Copying and pastingIntroduction Secure FolderCreating Secure Folder Setting auto lock for Secure FolderMoving content Removing apps from Secure Folder Adding appsAdding accounts Hiding Secure FolderMulti window Uninstalling Secure FolderSplit screen view Adjusting the window size Using additional optionsMaximising a window Sharing text or images between windowsMinimising the split screen view Registering an existing Samsung account Samsung accountRegistering your Samsung account Registering a new Samsung accountRemoving your Samsung account Transferring data via Smart SwitchTransferring data from your previous device Transferring data wirelessly via Wi-Fi Direct On the computer, launch Smart Switch Transferring backup data from a computerTransferring data via Samsung Cloud Connecting the device to a computer for data transferDevice and data management Updating over the air Updating with Smart SwitchUpdating the device Backing up and restoring data Performing a data resetUsing a Samsung account Using a Google accountSharing features Deactivating emergency mode Emergency modePlay Store Installing or uninstalling appsInstalling apps Galaxy AppsEnabling apps Uninstalling or disabling appsSetting app permissions Managing appsMaking calls PhoneReceiving calls During a voice call Blocking phone numbersOptions during calls Missed callsCreating a new contact ContactsAdding contacts During a video callEnter contact information Adding a phone number to Contacts from the keypadSynching contacts with your web accounts Adding a phone number to Contacts from the calls listImporting contacts Sharing contacts Searching for contactsDeleting contacts MessagesMerging duplicate contacts Viewing messages Sending messagesBlocking unwanted messages Setting the message notificationSetting a message reminder Browsing webpages InternetDeactivating secret mode Using secret modeActivating secret mode Changing security settingsReading emails CameraSending emails Launching Camera Using swipe gesturesTaking photos or recording videos Basic shootingLocking the focus AF and exposure AE Customising shooting modes Auto modePro mode Continuous shot PanoramaSports HDR Rich toneNight Tag shotSelfie Using the selfie flashSound & shot Applying beauty effects Wide selfieApplications Camera settings Camera settingsQuick settings Common GalleryViewing images Viewing images and videosViewing videos Viewing albumsViewing stories Deleting stories Syncing images and videos with Samsung CloudDeleting images or videos Creating storiesDeleting multiple images and videos Samsung NotesSharing images or videos Creating notesDeleting notes CalendarCreating tasks Creating eventsStarting S Health HealthSyncing events and tasks with your accounts Monitor your health and fitness Using S HealthAdditional information Making voice recordings Voice RecorderMy Files Setting alarmsStopping alarms Deleting alarmsDeleting clocks Creating clocksListening to the FM radio CalculatorRadio Scanning radio stations Google apps Google PhotosDuo Connections Wi-FiConnecting to a Wi-Fi network IntroductionTap Connect Wi-Fi DirectEnding the device connection BluetoothSending and receiving data Pairing with other Bluetooth devicesData usage Unpairing Bluetooth devicesLimiting data usage Flight modeNFC and payment Making payments with the NFC feature Using the NFC featureSending data Mobile hotspot and tethering Using the mobile hotspotLocation More connection settingsMobile networks Adding printer plug-ins PrintingDownload booster Sounds and vibrationOptions NotificationsDisplay Blue light filter Easy modeManaging shortcuts Advanced featuresSwitching to easy mode Wallpapers and themesSend SOS messages Adding emergency contacts Device maintenanceStorage Using the quick optimisation featureBattery Device security AppsLock screen and security MemorySamsung Cloud Cloud and accountsRemoving accounts AccountsManage cloud storage Adding accountsGoogle AccessibilityBackup and restore General management About device Software updateAppendix TroubleshootingForcing restart Resetting the deviceSound echoes during a call Battery depletes faster than when first purchased Photo quality is poorer than the preview Your device cannot find your current location Trademarks Copyright
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