How to factory reset your Android phone without losing important files
A factory reset returns an Android phone to its original software state by removing accounts, apps, settings, messages and files stored on the device. It can solve persistent crashes, free a phone before selling it, or give an older handset a clean start. The reset itself is straightforward; protecting your data beforehand requires more care.
Photos, videos, WhatsApp conversations, contacts, downloaded documents and two-factor authentication details can be spread across several apps and storage locations. A Google backup may cover some of them, but it does not automatically guarantee that every file, account or app setting will return exactly as before.
This matters if you are preparing a Samsung Galaxy, Google Pixel, Oppo, Xiaomi or another Android phone for a family member, trade-in or sale in Australia. A reliable backup over home Wi-Fi is safer than relying on mobile data, especially when a large camera library is stored on the device.
The safest approach is to audit your files, create at least one independent copy, check that the backup can be restored, remove security locks and then perform the reset. The process below also explains what to do after the phone restarts.
Check what is stored on the phone
Begin by opening the Files app or your phone’s file manager. Inspect folders such as DCIM, Pictures, Movies, Download, Documents, Recordings and Bluetooth. Files downloaded from a browser, Telegram, Messenger or a work app may not be included in the backup service you usually use. Copy anything valuable to a computer, USB-C flash drive or encrypted external storage.
Google Photos can back up pictures and videos, but open the app, tap your account image and check the backup status. A message such as “Backup complete” is useful, while “Backing up” means the process is still running. Open a few photos at photos.google.com on another device to verify that the files are available online rather than merely queued on the handset.
For documents, use Google Drive, OneDrive, Dropbox or a computer copy according to where you normally keep your files. Check PDF receipts, tax records, downloaded tickets, school work and audio recordings individually. If you have recently travelled between Sydney, Brisbane and Melbourne, confirm that travel photos and offline maps have synchronised before deleting anything.
Contacts may exist in Google Contacts, the phone’s local memory or a SIM card. In the Contacts app, check the account attached to your contacts and export a VCF file if you are uncertain. A reset does not erase contacts saved in a Google account, but it will remove contacts stored only on the device.
Back up chats, accounts and security tools
WhatsApp requires its own backup process. Open Settings, Chats and Chat backup, select the correct Google account and run a backup while connected to Wi-Fi. Check the date and size of the completed backup. If you need videos, ensure video backup is enabled; this can consume considerable storage and data. After the reset, WhatsApp can restore that backup only when you use the same phone number and Google account.
Other messaging apps have different rules. Some store conversations in the cloud, while others keep data locally or remove it when the app is uninstalled. Review Signal’s transfer or backup options, save important Messenger attachments, and download files from work or study apps that may not offer a full Android backup.
Authenticator apps deserve special attention. Google Authenticator can synchronise codes when cloud sync is enabled, while Microsoft Authenticator and other services may require a separate cloud backup or account recovery procedure. Before resetting, use each service’s transfer function or save its approved recovery codes. Do not assume that a screenshot of a one-time code is a safe substitute for a proper transfer.
Banking, government and transport apps often need fresh verification after a reset. Make sure you can access the email address and mobile number connected to your Commonwealth Bank, ANZ, NAB or Westpac account. If you use a digital licence, Medicare-related services, Myki in Melbourne, Opal in Sydney or a travel app, check its sign-in and recovery requirements before wiping the phone. Keep your physical cards and identity documents available in case an app requests verification.
For current Android and Google account features, it can also help to follow reliable technology coverage such as Google’s AI updates, while remembering that availability can vary by country, phone model and account. Australian users may see different rollout dates or settings from users in Nigeria.
Make an independent copy and prepare the device
A cloud backup is convenient, but a second copy protects you from an incorrect account, a failed upload or a forgotten password. Connect the phone to a computer with a suitable USB cable, unlock it and choose File Transfer when Android displays the USB notification. Copy the main folders to a clearly named folder, then open several files from the computer to confirm they work.
If you are using a microSD card, decide whether it contains files you need. Some Android phones treat the card as portable storage, while others format it as internal or “adopted” storage. Portable cards can usually be removed and kept safely, but adopted cards may be encrypted and unreadable in another phone. Back up the card before resetting and do not format it unless you are deliberately erasing it.
Review your Google backup under Settings, Google, Backup, although the menu names differ between manufacturers. It may include app data, call history, device settings, SMS and contacts. Check the amount of Google One storage available and leave the phone charging while the backup runs. A phone with a full account or a weak connection may show an incomplete backup without making the problem obvious.
Write down information that is not stored in a password manager, including the phone’s model, important email addresses and recovery methods. Make sure you know the Google account password before resetting. Android’s Factory Reset Protection can require the previously used Google account after the wipe; this security feature helps prevent a stolen phone from being reused.
If the phone is going to another person, remove your screen lock only after your backups are complete and after you have removed accounts. For a trade-in, follow the retailer’s instructions. Telstra, Optus, Vodafone and independent retailers can have different requirements for eSIMs, finance contracts and trade-in inspections. Do not leave an active eSIM on a handset that you are handing over unless the receiving process specifically tells you to transfer it.
Perform the factory reset safely
Charge the phone to at least 50 percent and keep it connected to a stable Wi-Fi network until the backup and verification work is finished. Remove the physical SIM if you are selling the device. An eSIM requires more care: during the reset menus, choose whether to erase the downloaded SIM only if you are transferring service or returning the phone. If you are keeping the number, confirm the replacement or transfer process with your carrier first.
On many recent phones, the reset path is Settings, System, Reset options and Erase all data. Samsung Galaxy devices commonly use Settings, General management, Reset and Factory data reset. Pixel, Motorola, Oppo and Xiaomi menus use different wording, so search Settings for “factory reset” if the option is difficult to locate.
Read the final warning carefully. It should state which accounts and data will be removed. Confirm the Google account or screen-lock credentials requested by the phone, then select Erase all data. The handset may restart several times and display the Android logo for a few minutes. Do not press buttons, disconnect power or attempt to interrupt the process.
When the welcome screen appears, the reset has generally completed. If the phone is being sold or traded, stop at the welcome screen rather than signing in again. The next owner can select a language and connect their own account. If you are keeping it, continue with setup and connect it to Wi-Fi before restoring data.
Some phones fail to boot normally because of a damaged system or forgotten passcode. Recovery-mode wiping is a last resort and usually involves a particular combination of power and volume buttons. The exact instructions vary by model, and a recovery reset does not bypass Factory Reset Protection. Confirm the model-specific method through the manufacturer’s support site before trying it.
Restore files and verify the result
During setup, sign in with the same Google account used for the backup. Android may offer to restore apps, contacts, settings, call history and SMS. Select the relevant backup and keep the phone on charge. Apps can continue installing after the home screen appears, so allow time for the process to finish before judging what is missing.
Open Google Photos, Contacts, Drive and your main messaging apps to confirm that content has returned. WhatsApp will ask for the same phone number and Google account used for its backup. Restore chats when prompted, then leave the app open on Wi-Fi while media downloads. Do not delete the old backup until you have checked several conversations and attachments.
Reinstall banking, transport, health and work apps from the official Google Play Store rather than unknown download sites. Sign in carefully and re-enable two-factor authentication. Check Google Wallet, transport cards and Bluetooth accessories. If you use an Android phone for tap-and-go payments in Melbourne or Sydney, cards may need to be added again for security reasons.
A reset is also an opportunity to remove unused apps and review permissions. Install system updates first, then update Google Play system components and essential apps. Confirm that calls, SMS, mobile data, Wi-Fi, camera, fingerprint unlock, Bluetooth and location services work. If your carrier supplied a custom configuration, check the access point name when mobile data does not connect.
For apps, games and older mobile software, use trusted sources and preserve your account progress through the developer’s own sign-in system. A collection of Java mobile apps may be useful for exploring older handset software, but legacy applications can have compatibility, security and file-format limitations on current Android versions.
Use a reset checklist for future phone changes
A simple checklist reduces the chance of losing something that is easy to overlook. Complete each item before selecting the erase command, and keep evidence of your backups until the replacement phone is working properly. This is especially useful when changing devices during a move, travelling, or managing several family phones on different Australian networks.
| Area to check | What to verify before the reset | What to do after setup |
|---|---|---|
| Photos and videos | Google Photos says backup is complete; computer copy opens correctly | Check recent albums and downloaded media |
| Contacts and calendar | Google account is syncing; export a VCF file if unsure | Confirm names, numbers, birthdays and events |
| Messages | SMS and WhatsApp backups show a recent date | Restore chats and inspect attachments |
| Documents | Download, Documents and recordings folders are copied | Open PDFs, receipts and work files |
| Authentication | Authenticator transfer or cloud backup is complete; recovery codes are available | Test two-factor login before discarding old access |
| SIM and eSIM | Carrier transfer is understood; physical SIM is removed if selling | Activate the correct SIM and test calls and data |
| Banking and transport | Login details and recovery methods work | Re-add cards and verify security checks |
| Device handover | Google account and personal accounts are removed | Leave the phone at the welcome screen |
Keep the old phone powered off but available for a short period if practical. Some services send an approval request to the previous handset, and an old authenticator may be needed while a new one is registered. Once the replacement works and the independent copies are confirmed, securely erase or recycle the old device according to the retailer’s instructions.
If an issue remains, manufacturer support pages and a moderated community forum can provide model-specific troubleshooting and user experiences. Avoid posting passwords, backup codes, identity documents or full device serial numbers publicly. A careful reset protects the phone’s next owner while giving you a clean Android installation without sacrificing irreplaceable files.