Changing the operating system on a mobile device is a process that is often confused with the usual installation of updates. In fact, by the phrase “how to change the operating system on Android,” users usually mean installation custom firmware (Custom ROM), which radically changes the interface and functionality of the device. Standard updates from the manufacturer only patch security holes or add minor functions, while changing the firmware opens up access to hidden capabilities Android.
This process requires technical literacy and an understanding of risks. You are not just updating the software, you are actually rewriting the system memory section of your gadget. If you are tired of advertising in the standard shell, slowdowns on an old device, or want to get a fresh version Android where the manufacturer has already stopped supporting, this article will become your guide. However, remember: any manipulations with the system software are performed at your own peril and risk.
Before taking action, you need to understand the difference between a stock system and a custom build. Stock firmware (Stock ROM) is the original software installed at the factory. Custom firmware (Custom ROM) is created by enthusiasts and can be based on a pure Android (like LineageOS) or be a modified version of the stock with extended rights. The choice depends on your goals: do you need stability or maximum configuration flexibility.
Preparing the device and collecting important data
The first and most critical step is to save all important information. The process of changing the operating system almost always involves completely clearing the internal memory of the device. Photos, contacts, instant messenger conversations and application settings will be permanently deleted. Therefore, creating a backup copy is not just a recommendation, but a prerequisite before starting any work.
Use cloud services like Google Drive or local copying to a computer via a USB cable. Pay special attention to folders with media files and messenger databases. It is also worth writing down the Wi-Fi network settings and passwords for important services, since after flashing the device will look like new out of the box.
⚠️ Attention: Before starting the procedure, make sure that the battery charge level is at least 60-70%. A sudden power outage while writing system files can turn your smartphone into a “brick,” the restoration of which will require expensive intervention at a service center.
In addition to backup, you will need to find out the exact model of your processor and bootloader version. Different chipsets (Snapdragon, MediaTek, Exynos) require different tools for flashing. There is no universal method for all devices, so searching for specific instructions specifically for your model on specialized forums is mandatory.
☑️ Ready for flashing
Unlocking the bootloader
Bootloader is a special app that runs before the operating system boots and checks the digital signatures of all launched components. By default, on most smartphones it is blocked by the manufacturer, which prevents the installation of unverified software. To change the operating system, you need to obtain the status Unlocked for the bootloader.
The unlocking procedure differs for different brands. Devices Xiaomi require official permission through the utility Mi Unlock and wait from 3 to 7 days. To Google Pixel or OnePlus just enter the command in fast boot mode. Owners Samsung need to switch special flags in Download Modemode. It is important to understand that unlocking the bootloader often voids your warranty.
Once unlocked, all data on the device will be erased automatically for security purposes. This is another reason to make a backup in advance. In addition, on some devices (for example Sony or old HTC), unlocking may lead to loss of camera quality due to the removal of encryption keys responsible for image processing.
What are DRM keys?
DRM keys (Digital Rights Management) are Security certificates stored in the bootloader. They are responsible for the operation of protected content (Netflix in HD, banking applications) and some camera functions. When unlocking the bootloader, these keys are often permanently deleted, which can lead to reduced shooting quality or the inability to view high-resolution content.
To unlock, you will need a computer with the package installed. ADB and Fastboot. By connecting your phone in a special mode, you send a command that unlocks it. A warning will appear on the device screen that the system may not work correctly - this is a standard message that needs to be confirmed with the volume buttons.
Installing custom recovery (TWRP)
The standard recovery menu (Stock Recovery) has limited functionality and only allows you to reset settings or install updates signed by the manufacturer. To install a third-party operating system, you need to replace it with a custom recovery, the most popular of which is TWRP (Team Win Recovery Project).
The installation process usually occurs through the mode Fastboot. You need to download the recovery file image (with the .img extension) corresponding to your model and flash it using a command through the terminal on your computer. After successful recording, it is important to immediately boot into the new menu so that the standard bootloader does not overwrite it back.
Interface TWRP supports touch control and allows you to make full system backups (Nandroid backup), clear partitions selectively and install archives with firmware directly from a memory card or USB drive. This is the main tool through which the operating system will be changed.
| Recovery type | Functional | Installation complexity | Security |
|---|---|---|---|
| Stock Recovery | Reset, OTA update | None (factory) | High |
| TWRP | Full access, backups, ZIP installation | Medium | Medium (depends on the user) |
| OrangeFox | Advanced TWRP functions, themes | High | Medium |
| PitchBlack | Minimalism, dark theme | Medium | Medium |
⚠️ Attention: Recovery menu interfaces and ways to enter They may differ depending on the Android version and manufacturer. Always check the combination of buttons (usually Volume Down + Power) for your specific model in the official documentation or on the developer forum.
Searching and selecting the appropriate firmware
Selecting the correct firmware is half the success. An error in selecting a file may cause the phone to stop turning on or the mobile network to not work. You should look for firmware on authoritative resources, such as a forum 4PDA or an international portal XDA Developers.
Pay attention to the firmware status. It can be marked as (stable), (test) or (daily build). For everyday use, it is recommended to choose only stable versions. Test builds may contain critical errors that lead to reboots or data loss. Stable (stable), Beta (test) or Nightly (daily collection). For everyday use, it is recommended to choose only stable versions. Test builds may contain critical errors that lead to reboots or data loss.
It is also important to check the compatibility of Android versions. When switching from one major version to another (for example, from Android 11 to Android 13), you may need to clear the partition. Ignoring this requirement often causes a cyclic reboot of the device (bootloop). Data And Cache. Ignoring this requirement often causes a cyclic reboot of the device (bootloop).
Always read the latest messages in the firmware thread on the forum before downloading. Users often write about critical bugs that the developers have not yet reflected in the file description.
In addition to the firmware itself, you may need additional packages, such as GApps (Google services package), if they are not pre-installed in the firmware. Without them, you will not be able to log into your Google account, download applications from the Play Market, or synchronize contacts.
The process of installing a new operating system
When all the files are downloaded and written to the media, the main stage begins. Load into the menu TWRP. The first step is to clean the partitions (Wipe). It is recommended to use the function Advanced Wipe and select sections Dalvik / ART Cache, Cache, System and Data. Do not touch the partition Internal Storageif the firmware files are there.
After cleaning, go to the installation menu (Install). Select the archive with the firmware and confirm the action by swiping. The recording process may take from 2 to 10 minutes depending on memory speed and file size. At this time, the operation log will be displayed on the screen - make sure that no error messages (Error) appear.
adb reboot recovery
Command to reboot into recovery mode from the computer
If the firmware does not include Google services, immediately after installing the main image, without rebooting the phone, install the archive GApps. Violation of this sequence may lead to errors during the first launch. After installing all components, press the button Reboot System.
⚠️ Attention: The first startup after changing the firmware always lasts longer than usual - from 5 to 15 minutes. Don't try to force reboot your phone if you see the Android logo or boot animation. Give the system time to initialize all services.
Strict adherence to the sequence of actions (Wipe -> Install ROM -> Install GApps -> Reboot) is the key to a successful installation without errors and cyclic reboots.
Initial setup and problem solving
After a successful boot, you will see a welcome screen. Set your language, connect to Wi-Fi, and sign in to your Google Account. Restore your data from backup if you used cloud backup. Your device is now running on the new operating system.
However, nuances may arise. Sometimes fingerprint, NFC or camera does not work. This is due to the fact that drivers in custom firmware may differ from stock ones. In such cases, it is worth looking for fixes or trying a different firmware version. It is also recommended to install a rights manager Magiskif you need complete control over the system.
Battery optimization is another important step. New systems may spend more power in the first few days until they learn your usage habits. Let the device work in normal mode for a couple of days before drawing conclusions about battery life.
What to do if the phone is stuck on the logo?
If the device is stuck in a reboot loop (Bootloop), boot into TWRP again. Try doing a full reset (Format Data) by entering the word "yes". If this does not help, the firmware may be incompatible with your hardware, and you should return the stock version via Fastboot or Download Mode.
Is it possible to return the stock firmware back?
Yes, it is possible. To do this, you need to download the official firmware image for your model and flash it through your computer using the manufacturer’s proprietary utilities (for example, Odin for Samsung, SP Flash Tool for MediaTek or Fastboot for Pixel). This will completely restore the device to its factory condition.
Will the warranty be void after changing the firmware?
In most cases, unlocking the bootloader and installing custom software will void the manufacturer's warranty. In addition, some brands (for example, Samsung) trigger the Knox tripper, which physically marks the fact of tampering with the system, making it impossible to use some protected functions even after returning to stock.
Is it safe to use banking applications on custom firmware?
The default is no. Banking apps and Google Pay check system integrity (SafetyNet/Play Integrity). For them to work, you need to hide superuser rights and replace system fingerprints using tools like Magisk Hide or special modules, but this is a constant arms race between firmware developers and banks.
Is Root access needed to change the operating system?
No, root access is not required required for installing the firmware. An unlocked bootloader and custom recovery are enough. However, many users receive Root access after installing a new system to expand its capabilities.
What is a “brick” and how to avoid it?
“Brick” is a slang name for a phone that stopped turning on due to a software error. To avoid this, never interrupt the firmware process, use only files intended specifically for your model, and carefully read the instructions on the forums before starting work.