Updating the operating system is not just a whim, but a necessity to maintain security and the performance of your device. Over time, manufacturers stop releasing official updates for older models, leaving users alone with vulnerabilities and an outdated interface. However, there are ways to bypass these restrictions and breathe new life into your smartphone by installing the latest version Android.
The flashing process requires certain technical training and an understanding of the risks. This is not an action that should be done “quickly” while traveling on the subway. You will have to interact with system memory partitions, work with the bootloader and, possibly, use special software tools on the computer. But the result is worth it: you get access to new features, battery optimization and modern applications.
In this article we will analyze all stages of the process: from preparing data to directly installing the system image. We will look at both official update methods and working with custom builds that allow you to go beyond the manufacturer's limitations. The main thing here is attention to detail and strict adherence to the algorithm of actions.
Device preparation and backup
The first and most critical step is to save all important information. Any manipulation with the firmware carries the risk of data loss, even if you are planning a simple over-the-air update. Photos, contacts, correspondence in instant messengers - all this should be securely stored on external media or in cloud storage.
Create a complete backup of the system using built-in tools Google or third-party utilities like Titanium Backup (for root access) or Swift Backup. Don't rely on contact syncing alone, as app settings and local data are often lost when changing OS versions.
⚠️ Warning: Be sure to check your battery level before starting any work. The device must be charged at least 60-70% to avoid turning off at the most critical moment of recording system files.
You also need to free up space in the internal memory. For installers to work correctly and unpack archives with firmware, free space is required, the amount of which depends on the size of the system image itself. Delete unnecessary caches, old downloads and heavy video files.
☑️ Ready for firmware
Unlocking the bootloader and USB debugging
To install unofficial or custom firmware, you will need to unlock the bootloader (Bootloader). This is a special app code that runs before the operating system and verifies the digital signature of the downloaded software. By default, it is blocked by manufacturers for security reasons.
The unlocking process differs for different brands. On devices Xiaomi requires account linking and waiting from 3 to 168 hours. On Motorola or OnePlus the process is simpler and is carried out by obtaining a unique code on the manufacturer’s website. Remember that unlocking the bootloader almost always leads to a complete reset of the device.
After unlocking, you must activate developer mode. To do this, go to Settings → About phone and quickly click 7 times on the build number. In the menu that appears, find the item USB debugging and activate it. This will allow the computer to interact with the phone at a deep system level through the protocol ADB.
What is Download or Fastboot mode?
These are special boot modes that differ from the usual turning on of the phone. In Fastboot mode (usually with pure Android), you can flash partitions directly from the PC. Download mode (typical for Samsung) is used for flashing firmware via the Odin app. They are usually entered by a combination of the volume and power buttons when the device is turned off.
Selecting the type of firmware: Stock or Custom
The user is faced with a choice: install the official stock firmware of a newer version or try a custom build from independent developers. Stock firmware guarantees stable operation of all hardware modules, including the camera and NFC, but their functionality is limited by the manufacturer’s vision.
Custom firmware, such as LineageOS, Pixel Experience or crDroid, offer a clean interface, no pre-installed bloatware and the ability to get the latest versions. Android on devices that the manufacturer has already stopped supporting. However, there may be problems with the operation of specific hardware.
When choosing a custom build, pay attention to the status of the project: Nightly (daily test builds), Weekly (weekly) or Stable (stable). For everyday use, it is better to choose stable versions tested by the community. Never download firmware from dubious forums without reviews.
| Firmware type | Stability | Functionality | Installation complexity |
|---|---|---|---|
| Official (Stock) | High | Standard | Low |
| Custom (Stable) | Medium/High | Advanced | Medium |
| Custom (Nightly) | Low | Maximum | High |
| GSI (Generic) | Variable | Basic | High |
Installing recovery and drivers on a PC
To replace the system partition, you will need a modified recovery menu - Custom Recovery. The most popular solution is TWRP (Team Win Recovery Project). It allows you to install firmware from a memory card or via a connection to a computer, as well as make full system backups (Nandroid backup).
Before connecting your phone, make sure that the correct drivers are installed on your computer. For devices based on processors Qualcomm you need Qualcomm USB Drivers, for MediaTek -MTK VCOM Drivers. Without them, the computer will not see the phone in firmware mode, and the process will end with an error.
The recovery installation process usually occurs through the computer using the Fastboot command. Connect the phone in bootloader mode and enter the command in the terminal:
fastboot flash recovery twrp-image.imgImmediately after flashing the firmware, it is important not to boot into a regular system, but to go into recovery mode, otherwise the stock recovery may overwrite the installed TWRP. The combination of buttons depends on the model, but most often it is Volume Down + Power.
Use only the original USB cable that came with the kit. Cheap "charge only" cables do not transfer data and may cause communication failure during flashing.
Flashing process and partition wiping
When you are in the TWRP menu, the first thing you need to do is wipe the data. Go to the Wipe section and select Advanced Wipe. Check the boxes Dalvik / ART Cache, Cache, System and Data. Do not touch the partition Internal Storageif you store the archive with the firmware there.
After cleaning, return to the main menu and select Install. Find the downloaded firmware archive (usually .zip format) and swipe to confirm installation. The process will take from 2 to 10 minutes depending on the memory speed and data volume.
⚠️ Attention: If you are moving from one version of Android to another with a radically different partition structure, you may need to format the Data partition (Format Data), rather than just Wipe. This will delete all files in the internal memory.
Often, along with the firmware, you need to install a package of services Google (GApps), since they are not available in custom builds due to licensing restrictions. Download a suitable package (for example NikGapps or OpenGApps) and install it immediately after flashing the OS without rebooting the phone.
The order of actions is critical: First Wipe (cleaning), then Install (firmware), then GApps (services), and only at the end - Reboot (reboot). Violation of the sequence can lead to a cyclic reboot.
First boot and error correction
The first startup after flashing always takes longer than usual. The system optimizes applications, configures drivers and creates new configuration files. The loading screen can hang on the logo from 5 to 15 minutes. Do not panic and do not try to forcefully reboot your device.
If the phone is stuck in an endless reboot (bootloop), you need to return to Recovery mode and try to clear the Cache and Dalvik partitions again. In the worst case, you will have to look for a different firmware version or return the stock image via a computer.
After a successful download, set up the device as new or restore the data from a backup. Check the operation of all modules: camera, Bluetooth, Wi-Fi, sound and fingerprint sensor. Custom firmware sometimes has bugs with specific functions that you should know about in advance.
⚠️ Attention: Recovery menu interfaces and item names may differ depending on the TWRP version and device model. Always check the documentation for your specific gadget before pressing buttons.
Your smartphone is now running the new version of the system. Regularly check for updates to your installed custom firmware, as developers often release security patches and bug fixes.
Is it safe to unlock the bootloader?
From a physical device point of view, yes, it is safe. However, this voids the manufacturer's warranty and reduces the overall level of data security, since an attacker with physical access can more easily obtain data from an unencrypted device.
What to do if the computer does not see the phone in Fastboot mode?
Try a different USB port (preferably USB 2.0 on the back of the system unit), replace the cable or reinstall the ADB/Fastboot drivers manually through the device manager.
Is it possible to return to the official firmware after a custom one?
Yes, to do this you need to unlock the bootloader again (if it is closed) and flash the full stock image (Fastboot ROM) through the computer or the manufacturer's Recovery mode.
Will IMEI be erased when firmware?
If only system partitions (System, Boot, Recovery) are flashed correctly, IMEI is not affected. It is stored in a separate protected EFS/Modem section, which should not be touched unless absolutely necessary.
Why are GApps needed and is it possible without them?
GApps (Google Apps) is a package of Google services (Play Market, YouTube, Gmail). Without them, you will not be able to install applications from the official store. You can use the phone without them by installing software through alternative stores like F-Droid.