You reach for your ASUS ROG Phone 9 in a dark room, tap the flashlight tile, and nothing happens; the rear LED stays dark even though the icon says it is on. It is a frustrating moment, especially on a phone this capable, but a dead torch is usually a software hiccup, a blocked lens, or a camera app that has quietly grabbed the LED, not a broken part. The fixes below are ordered from the quickest and safest checks to the official reset and repair paths, so you can stop at the first one that brings the light back. Everything here follows ASUS's official guidance that covers the ROG Phone 9, the base model running Android 15 with ROG UI.
Toggle the flashlight off and on from Quick Settings
Start with the control you already use, because a stuck toggle is the single most common cause. ASUS's official guidance is simple: "Enter Quick Settings > Enable Flashlight to check whether the flashlight works." Swipe down from the top of the screen, find the Flashlight tile, and tap it a couple of times to confirm the rear LED actually switches on and off.
If the tile is missing from your panel, tap the edit (pencil) button in Quick Settings and drag the Flashlight tile into the active area. Sometimes the LED is working fine and only the shortcut had fallen out of view. This is the fastest and safest first check, so do not skip it.
Check the Camera app's flash setting, then close the camera
The same LED serves both the torch and the camera flash, so a camera setting can quietly override your expectations. Open the Camera app and, per ASUS, "check the condition and setting of flashlight by tapping the lightning icon at upper left for adjustment" so the flash is not set to off. While you are there, switch the flash to on or auto and take a quick test shot to see the LED fire.
After that, fully close the Camera app from the recent-apps view. An open camera can hold onto the LED, which leaves the Quick Settings torch unresponsive until the app lets go. Close it, then tap the Flashlight tile again.
Take off any case, cover, or accessory over the rear LED
Sometimes the light is on and you simply cannot see it. ASUS notes: "Protective cases, accessories, or screen protectors may block the flashlight. Please try removing them to see if it improves." A thick case, a stray sticker, or a clip-on accessory sitting over the rear camera area can mask the LED almost completely.
Remove the case (and any clip-on accessory or sticker covering the rear camera area), then test the flashlight again in a dim space so even a faint glow is obvious. If the light reappears once the obstruction is gone, you have found the culprit; reposition or replace whatever was covering the lens area.
Restart the phone, or force a restart if it has frozen
A normal restart clears the temporary software glitches that can leave the LED stuck. Hold the Power key, choose Restart, and let the phone boot fully before you try the torch again.
If the phone is unresponsive and will not restart the usual way, use ASUS's force-restart sequence for the ROG Phone 3 / Zenfone 7 and later group, which includes the ROG Phone 9: "Press and hold volume down and power simultaneously for at least 8 seconds. If it doesn't restart after 8 seconds, try pressing and holding both buttons for 12 seconds." Note that this is Volume Down plus Power together, not the Power button on its own. Once the phone is back up, test the flashlight from Quick Settings.
Let the phone cool down and ease off heavy tasks
Long, demanding sessions generate heat that can interrupt normal operation, and a hot phone is a phone that may not behave as expected. ASUS's overheat guidance is to avoid pushing the hardware: "Do not run apps that may use much memory for long time, for example, 3D games and video," and "It's recommended that do not use your device while it is charging."
So if you have been gaming hard or watching video while plugged in, stop, unplug the charger, and set the phone down for a few minutes. Once it has returned to a normal temperature, open Quick Settings and try the flashlight again.
Install the latest system software
Firmware updates often carry fixes for camera and flash bugs, so an out-of-date system can be the quiet reason the LED misbehaves. Go to Settings > System > System update and tap "Check Update." (ASUS's flashlight guidance phrases the same path as "Settings > System > System updates > Check now.")
If an update is offered, follow the on-screen steps to download and install it. Make sure the phone has plenty of battery, or stay plugged in, so the update can complete without interruption. After the phone reboots, check whether the torch is back.
Boot into Safe Mode to rule out a rogue app
A downloaded app, such as a third-party flashlight or camera tool, can grab the LED or conflict with the system torch. Safe Mode loads only the built-in apps, which makes it easy to tell whether one of your installs is to blame. To enter it, ASUS's steps are: "Long press Power key > Tap and hold the Power Off > Tap Ok."
Once in Safe Mode, test the flashlight. If it works there, a third-party app is the cause, so restart normally to leave Safe Mode and uninstall the apps you added most recently, starting with anything that controls the camera or torch. Test again after each removal until the conflict is gone.
Back up your data, then perform a factory reset
If software fixes have not helped, a factory reset is the last on-device step before you treat this as hardware. Back up everything important first, because this erases the phone. The path is Settings > System > Reset options > Erase all data (factory reset), then tap "Erase all data."
Be clear about what this does. ASUS warns: "Once the Factory Reset is completed, all data, apps, settings and personal information will be deleted from the device after the initialization." After the reset, set the phone up and test the flashlight before restoring all of your apps, so you can confirm a clean system fixed it.
Reach out to an ASUS Service Center
If the flashlight still refuses to turn on after every step above, the issue is likely the LED itself or its driver, which is a hardware fault rather than something you can fix from the menus. ASUS's flashlight guidance closes on exactly this point: "please contact ASUS Service Center for additional technical support."
Have your phone's details and a short summary of the troubleshooting you already tried ready, since it will speed up the inspection. A service center can examine the LED and camera module and carry out any repair the phone needs.
Frequently Asked Questions
Why does my ROG Phone 9 flashlight icon turn on but no light appears?
The most common reasons are a physical obstruction or the camera holding the LED. Check that no case, sticker, or accessory is covering the rear LED, as ASUS notes these "may block the flashlight," and fully close the Camera app so it releases the light. Then toggle the Flashlight tile in Quick Settings again.
Is the flashlight controlled through Armoury Crate?
No. Armoury Crate is the ROG Phone's control hub for performance, lighting, and firmware, but the flashlight itself is toggled from Android Quick Settings, not from Armoury Crate. You do not need any separate companion app to use the torch.
What is the correct way to force restart a frozen ROG Phone 9?
Use Volume Down plus Power together, not the Power button alone. ASUS's sequence for this phone is to "Press and hold volume down and power simultaneously for at least 8 seconds. If it doesn't restart after 8 seconds, try pressing and holding both buttons for 12 seconds."
Can overheating affect the flashlight?
Heavy use generates heat that can interrupt normal operation, so it is worth letting the phone cool down. ASUS advises against running memory-heavy apps such as 3D games and video for long stretches and against using the device while it is charging. Stop the heavy task, let the temperature return to normal, then retry the torch.
Will a factory reset fix the flashlight, and will it erase my data?
A factory reset can clear stubborn software faults, but it does erase the phone, so back up first. ASUS warns that "all data, apps, settings and personal information will be deleted from the device after the initialization." If the torch still fails after a reset, the cause is likely hardware and you should contact an ASUS Service Center.
