Resetting a smartphone to factory settings is a radical solution that users resort to for a variety of reasons: from banal selling a gadget to fighting viruses or system “brakes.” But what actually happens to the phone after this procedure? Will photos be deleted from Google Photos? Will WhatsApp messages disappear? Will I have to configure all the applications again? In this article, we will analyze all the consequences of a reset —from obvious to hidden—and explain how to minimize data loss.

Many people mistakenly think that a “hard reset” simply clears memory, like formatting a flash drive. In fact, this is a complex operation that affects system files, accounts, security settings even hardware identifiers of the device. For example, after a reset, the phone may “forget” those associated with it Bluetooth devices or lose access to some functions of banking applications. And if you do not make a backup copy in advance, it will be extremely difficult - or impossible - to restore deleted data.

In the article you You will find not only the theory, but also practical tips: how to properly prepare for a reset, what data can be returned after it, and why sometimes the procedure does not solve problems with “lags”. We will also look at myths - for example, is it true that resetting speeds up old phones, and what to do if the device does not turn on after it.

📊 Why did you last reset your phone to factory settings?
Preparation for sale
Eliminating viruses/malware
Speeding up your phone
Deleting personal data before transferring it to another person
Other

1. What exactly is deleted when resetting to factory settings?

The reset procedure erases all user information from the phone's internal memory, but does not affect Android system files. Here is a complete list of what will disappear irrevocably (if you don’t make a backup):

  • 📱 Installed applications and their data (game saves, cache, settings). For example, chats will be deleted in WhatsApp if synchronization with Google Drive has not been enabled.
  • 📸 Media files: photos, videos, music and documents stored in the phone memory (not on the SD card!). An exception is files in cloud services (Google Photos, Yandex.Disk).
  • 📝 Contacts, SMS/MMS and journal callsif they are not synchronized with Google Account.
  • 🔑 Wi-Fi, Bluetooth, VPN settings and other network parameters. You will have to re-enter network passwords.
  • 🎨 Interface personalization: wallpaper, widgets, icon layout on the desktop.
  • 🔒 Local accounts (for example, in Mi Account on Xiaomi or Samsung Account), if you have not logged out before resetting.

What is not deleted:

  • 💾 Data on SD card (if it is not encrypted as part of the internal memory).
  • ☁️ Files in cloud storage (Google Drive, Dropbox), if they are uploaded there in advance.
  • 📱 System updates: the phone will remain on the current version of Android, but will return to the “clean” firmware without user changes.
⚠️ Attention: On some models (for example, Samsung Galaxy s Knox) a reset can activate hardware protection that blocks access to certain functions (for example, Samsung Pay). This is irreversible!

2. How does a reset affect phone performance?

Many users believe that resetting to factory settings is a universal cure for slowdowns. In fact, the effect depends on the reason for the slowdown:

  • ✅ It will help: if the phone lags due to an overloaded cache, conflicting applications or fragmented data. After the reset, the system will return to the “clean” state.
  • ❌ Will not help: if lags are caused by physical wear (for example, a degraded battery or an overheating processor) or outdated firmware (for example, Android 8 on a weak chipset).

According to tests Geekbench, after a reset, the processor and memory performance returns to the original values (like a new phone), but the effect is temporary: after 2-3 months of active use, the “brakes” may return if you do not optimize work with applications.

Parameter Before reset After reset After 3 months
Application opening speed Slow (3–5 sec) Instant (1–2 sec) Depends on the number of installed apps
Battery life Reduced by 15–20% Restored to original Reduced in proportion to battery wear
Free memory 80–90% occupied 30–40% occupied (system files) Depends on user activity

Important: if the phone overheats or turns off spontaneously, a reset is unlikely to help - these are symptoms of hardware problems (for example, a faulty battery or thermal paste).

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Before resetting, check the battery condition in the engineering menu (code ##4636##). If the value Battery health is below 70%, the problem is in the battery, not in the software.

3. What will happen to Google, Samsung, Xiaomi and other accounts?

Reset to factory settings does not delete the accounts themselves (for example, Google Account or Mi Account), but breaks their connection with the phone. After rebooting, the device will ask again:

  • 🔑 Enter the login and password for Google (required to activate the phone).
  • 📱 Confirm ownership of the manufacturer's account (for example, via SMS or backup email on Samsung or Huawei).
  • 🔄 Restore data synchronization (contacts, calendar, notes).

On phones with factory locking (FRP - Factory Reset Protection) after the reset, you may be asked to enter the data of the last linked one. Google Account. This is protection against theft! If you forget your password, it will be difficult to unlock your phone - you will need confirmation via a backup email or phone.

⚠️ Attention: On some models Xiaomi i Realme resetting without first logging out Mi Account or Realme ID leads to blocking the device for 72 hours! Before the procedure, be sure to log out in your account settings.

How to avoid problems with accounts:

☑️ Preparing accounts for reset

Done: 0 / 4

4. Is it possible to recover data after a reset?

recover deleted data after a reset reset possibly, but not always. Success depends on three factors:

  1. Availability of a backup copy (backup) in the cloud or on a PC.
  2. Memory type: on phones with eMMC (budget models) the chances are higher than on devices with UFS (flagships).
  3. Actions after reset: if you immediately started using the phone, new data will overwrite the old ones.

Recovery methods:

  • ☁️ Cloud backups: Google automatically saves contacts, SMS and some settings. To restore, when you turn it on for the first time, select “Restore from backup.”
  • 💻 Local backups: if you made a copy through adb backup or apps like Titanium Backup (root access required).
  • 🔍 Specialized apps: Dr.Fone, EaseUS MobiSaver or DiskDigger can scan the phone's memory, but success is not guaranteed.

Important: do not write down new data to the phone after the reset, if you want to restore the old ones! Each new file reduces the chances of success.

Can WhatsApp be restored after a reset?

Yes, if synchronization with Google Drive was enabled before the reset (Settings → Chat → Backup). After reinstallation, WhatsApp will offer to restore chats from the latest copy. If there is no backup, the data is lost forever.

5. Step-by-step guide: how to reset your phone correctly?

To avoid mistakes, follow this algorithm:

  1. Make a backup copy:
    • 📱 Contacts, SMS, settings: Settings → Google → Backup.
    • 📸 Photo/video: download to Google Photos or copy to PC.
    • 🎮 Game saves: use the built-in cloud saving functions (for example, in Genshin Impact or Clash of Clans).
  2. Log out of all accounts:
    • 🔑 Google Account: Settings → Accounts → Google → Delete account.
    • 📱 Manufacturer account: on Samsung — Settings → Accounts and archiving → Accounts → Samsung Account → Delete.
  3. Reset:
    • 🔄 Standard method: Settings → System → Reset → Reset to factory settings.
    • 🛠️ If the phone does not turn on: press Power + Volume Up to enter Recovery Mode, then select Wipe data/factory reset.

On some phones (for example, OnePlus or Oppo), the reset path may be different. If you do not find the item in the menu, use the search in the settings (magnifying glass icon at the top of the screen).

⚠️ Attention: On phones with data encryption (enabled by default on Android 10+) the reset may take up to 1 hour. Do not interrupt the process, even if the screen hangs on the logo for a long time!

6. data-i="213">Even experienced users make mistakes when resetting. Here are the most common:

Even experienced users make mistakes when resetting. Here are the most common:

  • 🚫 Not logging out of accounts → phone locking (FRP) or synchronization problems.
  • 🚫 Reset without charging → if the battery runs out during the process, the phone can turn into "brick".
  • 🚫 Ignoring backups → irretrievable loss of data (especially critical for WhatsApp i Telegram).
  • 🚫 Using unofficial firmware → after resetting the phone may won't boot.

How to avoid problems:

  • ✅ Before resetting charge the phone to at least 50%.
  • ✅ Check encryption is disabled (if it interferes with data recovery). Path: Settings → Security → Encryption.
  • ✅ If the phone root-ovonremove root access before resetting, otherwise you risk getting a bootloop (boot loop).
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If after resetting the phone does not turn on or hangs on the logo, try going into Recovery Mode and running Wipe cache partitionThis is safe and often solves the problem.

7. Myths about resetting to factory settings

There are many misconceptions around this procedure. Let's look at the most popular ones:

  • 🔄 Myth 1: "Resetting completely erases data without the possibility of recovery."
    Reality: Using specialized software (for example, Autopsy or Oxygen Forensic) some of the data can be restored if the memory was not overwritten.
  • ⚡ Myth 2: "Resetting speeds up the phone forever."
    Reality: The effect is temporary. After a few months of active use, performance will drop again.
  • 📱 Myth 3: "After a reset, the phone becomes like new."
    Reality: Hardware wear and tear (battery, screen, connectors) does not go away. The reset affects only the software part.
  • 🔒 Myth 4: "Resetting removes viruses 100%."
    Reality: Some malware (for example root viruses) can be saved in the recovered firmware or boot partition.

If your goal is selling a phone, one reset is not enough to completely clear the data. Use specialized tools like Secure Erase (available in some custom recovery, for example, TWRP), which overwrite the memory with zeros.

FAQ: Answers to frequently asked questions

❓ What should I do if, after resetting, the phone requires the old Google Account, but I don’t remember it?

This works FRP (Factory Reset Protection). Solutions:

  1. Try to restore access to your account via Google recovery page (you will need a backup email or phone).
  2. If the account is lost forever, contact the service center with proof of purchase of the phone (they can reset the FRP through special software).
  3. For some models (for example, Samsung) there are bypass methods using OTG cable and configuration files, but they require technical skills.

⚠️ Beware: “FRP bypass” services in unofficial services may be fraudulent!

❓ Will the photos return to Google Photos after the reset?

Yes, if:

  • The photos were uploaded to the cloud before the reset (check if photos.google.com).
  • You are using the same Google Account after the reset.
  • In the settings Google Photo the "Startup and synchronization" option is enabled.

If the photos were stored only in the phone memory and were not synchronized, they will be deleted irrevocably.

❓ Why did the phone become slower after the reset?

Possible reasons:

  • 🔋 Degraded battery —check its health in the application AccuBattery.
  • 📱 Outdated firmware —after resetting, the phone remains on the same version of Android, which may not have been optimized.
  • 🗑️ Automatic data recovery —if you restored the backup, the old “brakes” could come back with it.

Solution: update the firmware, calibrate the battery and install only the necessary applications.

❓ Is it possible to reset only the settings without touching the files?

Yes, most phones have an option "Reset settings" (without deleting data). Path:

Settings → System → Reset → Reset settings (or "Reset settings")

This option:

  • ✅ Will reset Wi-Fi, Bluetooth, sound, display settings.
  • ✅ Removes passwords from networks.
  • ❌ Will not touch photos, videos, documents and installed applications.
❓ How to reset a phone if it is locked?

If you forgot the pattern key or PIN code, there are two options:

  1. Through Recovery Mode:
    1. Turn off the phone.
    2. Hold Power + Volume up (on some models - Power + Volume down).
    3. In the recovery menu, select Wipe data/factory reset (control volume buttons, confirmation - power button).
  2. Through Find My Device (for Google Account):
    1. Go on device search page.
    2. Select your phone and click “Erase data.”

    ⚠️ After this, the phone will require you to enter data from the last linked Google Account (FRP)!