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Usually, no. A factory reset removes user data and installed apps, but it does not reinstall the phone’s operating system or replace its factory firmware. If malicious software is built into that software, a reset may leave it in place—or the same preinstalled app may appear again afterward.
What a factory reset does—and what it does not
A factory reset is meant to erase data stored on the phone, including installed apps and their data. Google’s Android reset instructions also warn that backed-up data may be restored during setup. The reset is not the same as installing a fresh operating system.
Android’s RecoverySystem API reference explains the distinction: “This is sometimes called a ‘factory reset’, which is something of a misnomer because the system partition is not restored to its factory state.” In practical terms, a reset targets the user-data layer; it does not, by itself, replace the system image, recovery environment, or firmware with known-good files.
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Why preinstalled software may still be there
If an app is included in the phone maker’s factory software image, wiping user data does not remove that image. The app may therefore still be present after the reset or return during setup. This does not mean every preinstalled app is malicious, or that a particular phone is infected. Reset behavior varies with the device’s software and partition layout.
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“Preinstalled” can also mean different things: an app bundled by the phone maker, one added by a carrier, or software installed by a seller. A reset alone may not establish which of those sources is involved or whether the underlying operating system is compromised.
Choose the remedy based on where the problem may be
| Remedy | What it addresses | Limit |
|---|---|---|
| Factory data reset | User data, settings, and installed apps and their data | Does not restore the system partition; factory-supplied software may remain or return. See Google’s reset instructions and the RecoverySystem reference. |
| Official firmware restoration | Replaces supported system or firmware images using the manufacturer’s files for a specific device | Device-specific and technically sensitive; it is not an ordinary reset. Google’s cited factory images are for supported Pixel and Nexus devices. See Google’s factory image instructions. |
Firmware restoration is not a guaranteed cure if the original factory image itself is suspected: reinstalling the same image could preserve the suspected software. Ask the manufacturer to investigate rather than assuming that reinstalling stock firmware will make every device clean.
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What to do if you suspect malware
1. Check for a user-level cause first
If you have no specific evidence of firmware compromise, update Android and Google Play system components, remove suspicious apps you installed, and review app permissions. Pay particular attention to apps with device-admin or accessibility access. A recurring symptom by itself does not prove that malware is built into the firmware.
2. Prepare before resetting
Follow the instructions for your exact device. Before erasing it, confirm that you know the Google Account username and password and the screen-lock credentials, and check that important files are backed up. A reset erases local data; account-backed data may be restored. Google says the process may take up to an hour. Its reset guide covers preparation and device-specific instructions.
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3. Set up cleanly while diagnosing a recurring problem
If you reset, avoid restoring all apps and data at once where the setup options allow it. Reinstall only trusted apps from a trusted source, selectively. This can help distinguish a user-installed app or restored data from a problem that remains on the device.
4. Escalate possible operating-system compromise to the maker
If the phone shows an operating-system integrity warning and you did not intentionally modify its software, Google recommends contacting the manufacturer. For supported Pixel and Nexus models, Google provides factory images; its instructions are model-specific and call for relocking the bootloader after flashing for security.
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For other Android models, ask the manufacturer or an authorized repair provider for the official signed-firmware restoration procedure for your exact model. Do not use random firmware downloads or generic flashing instructions: the wrong image or procedure can damage the device, and a generic guide cannot establish that a particular firmware image is trustworthy.
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Researchers have examined malicious apps found in Android firmware, but that fact alone does not show how common such infections are on current retail phones or how often they survive a reset. No reliable prevalence figure is established here, so a preinstalled app or a suspicious symptom should not be treated as proof of factory-installed malware.
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