power off Galaxy S9

How to reboot Galaxy S9 and S9+ if Galaxy S9 hangs?

Everything you need to know on powering on, powering off and rebooting Galaxy S9 and S9+.

You may already know to use the power button to power on, power off and reboot Galaxy S9 or S9+.

But occasionally, the power button may be not working as expected. You may have to use button (key) combinations to power off, power on or restart Galaxy S9 or S9+.

This Galaxy S9 guide explains how to reboot, power on and power off Galaxy S9 and S9+ in both normal situations and abnormal situations (e.g. when Galaxy S9 or S9+ hangs.).

Please note, in this guide, we do not differ reboot and restart. They are used interchangeably.

Why do you need to reboot Galaxy S9 or S9+ periodically?

You may know you have to reboot Galaxy S9 when you update the phone. In this case, some system files being used have to be replaced. Therefore, you need to “stop” the system, then restart the system with the updated files.

For apps, normally, it is not necessary to reboot Galaxy S9 if you update them. Apps in Android are running in its own container. The system can destroy the container and then reload the app with updated apps on Galaxy S9 or S9+. Therefore rebooting Galaxy S9 or S9+ is generally not required for updating apps on the phone.

But some tech guys may tell you to reboot Galaxy S9 or S9+ periodically (from once a month to once a week, NOT daily) to make the phone more responsive.

This is actually a valid suggestion.

When you reboot Galaxy S9 or S9+, all app leftovers (some apps sometimes may fail to clean up their own files after you close them) and ghost processes will be cleaned.

How to automatically reboot Galaxy S9 or S9+?

Samsung added the feature of “auto restart” feature in Galaxy S9 and S9+.

You can enable auto restart on Galaxy S9 and S9+ in Settings — General management — Reset— Auto Restart.

As shown in the screenshots below, you can enable auto restart so that Galaxy S9 or S9+ will be rebooted automatically within one hour of the specified time.

You can only set the schedule as once a week only. Frequently restarting/rebooting Galaxy S9 and S9+ will not be helpful.

How to power off and reboot Galaxy S9 and S9+ with the power button options?

The safest way to power off or reboot Galaxy S9 or S9+ is … Read the rest

How to use Galaxy S9 safe mode on Galaxy S9 and S9+?

Galaxy S9 safe mode guide: what is Galaxy S9 safe mode? when you need it? how to enter Galaxy S9 safe mode? how to use it?

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You can use Galaxy S9 safe mode to identify possible causes of some problems or strange behaviours of Galaxy S9 and S9+.

This safe mode is safe for your data, settings and apps. They will not be affected or altered when using the safe mode on Galaxy S9 and S9+.

This Galaxy S9 how-to guide shows you when you may need Galaxy S9 safe mode, two ways to enter the safe mode for Galaxy S9 and S9+, and how to use and exit Galaxy S9 safe mode.

What is Galaxy S9 safe mode? And when do you need Galaxy S9 safe mode?

Like most other Android phones, Galaxy S9 and S9+ have a special Galaxy S9 safe mode letting you troubleshoot possible problems caused by third-party apps.

In Galaxy S9 safe mode, all third-party apps installed by you were temporally disabled so that you can determine whether the problem is caused by such apps.

Your data, settings, and app data are not affected when you reboot Galaxy S9 or S9+ into Galaxy S9 safe mode

Galaxy S9 safe mode can only determine whether some strange behaviours or problems are caused by third-party apps. It is not able to pinpoint the app.

Unlike Galaxy S9 recovery mode which is not part of Android OS, Galaxy S9 safe mode is a special mode of Android OS.

So, under Galaxy S9 safe mode, you can still make and receive calls, connect to the Internet, use pre-installed apps. The safe mode only prevents you from using apps installed by you.

You need to try Galaxy S9 safe mode before you visit the service centre because technical support in most service centres does not solve issues due to third-party apps. They only diagnose problems in the firmware and pre-installed apps.

Although Galaxy safe mode does not change your data and settings, you may lose some home screen customizations after you exit the safe mode.

How to reboot into Galaxy S9 safe mode?

There are two ways to reboot into Galaxy S9 safe mode:

Use the power button options if Galaxy S9 or S9+ is currently powered on.
Use buttons if the phone is powered off.

Method 1: Use power button options to reboot into Galaxy S9 safe mode

If the phone is powered on, you can long press (press and hold) the power button for about 2-5 seconds to get the power button … Read the rest

How to reboot into Galaxy S9 recovery mode and to clear Galaxy S9 cache partition on Galaxy S9 and S9+?

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You can use Galaxy S9 recovery mode to flash new ROMs, clear Galaxy S9 cache partition, and to check recovery logs.

Although Galaxy S9 recovery mode was designed for some advanced users, you may need some of the features, especially clearing the cache partition to fix some problems after a major update.

This Galaxy S9 guide explains to you the functions of Galaxy S9 recovery mode, the way to reboot Galaxy S9 or S9+ into recovery mode, usage of the recovery mode, and methods of clearing Galaxy S9 cache partition.

What is Galaxy S9 recovery mode?

All Android phones have a special mode: recovery mode, which allows you to fix any Android problems and perform some actions (for example, patch the system) to the Android system without loading Android OS.

In the phone storage layout, there is a special partition for recovery. This partition is protected from Android OS and other partitions.

Galaxy S9 is not an exception.

If you think you never used Galaxy S9 recovery mode, you are very likely wrong.

When you install updates (including monthly security updates) for Galaxy S9 and S9+, you may notice the phone will reboot twice automatically.

During this updating process, Galaxy S9 or S9+ would reboot into Galaxy S9 recovery mode first to apply the update, then reboot into Android OS so that you can use Galaxy S9 and S9+.

Of course, Galaxy S9 recovery mode offers more functions including:

To apply Android OS update
To reset (factory data reset) Galaxy S9 or S9+.
To wipe/clear Galaxy S9 cache partition.
To boot into bootloader (download mode).
To flash official or third-party ROMs for Galaxy S9 and S9+.
To mount /system partition manually.
To check recovery logs.
To run graphics test.

Although Galaxy S9 recovery mode is seldom used for most Galaxy S9 and S9+ owners, you may need to reboot into Galaxy S9 recovery mode to fix some problem with your S9 or S9+.

In fact, most Galaxy S9 and S9+ owners reboot the phone into Galaxy S9 recovery mode to clear the cache partition to fix some issues after a major Android update.

You should not confuse Galaxy S9 recovery mode with Galaxy S9 safe mode, which is a special mode of Android OS.

How to reboot into Galaxy S9 recovery mode?

The key combination to reboot into Galaxy S9 recovery mode is Bixby button+ Volume up… Read the rest