How to flash Xiaomi Redmi 9A: 3 proven ways (Fastboot, Recovery, OTA)

Why do you need to flash Redmi 9A and when?

Xiaomi Redmi 9A (codenamed dandelion) remains one of the most popular budget devices even years after its release. However, over time, its performance may decline due to outdated software, bugs or system load, and firmware helps solve these problems, but it is important to understand that this is not a universal medicine, but a tool with clear readings.

You definitely need a firmware if:

• 📱 The smartphone slows down, overheats or spontaneously reboots after updates
• 🔄 Hangs on the logo. MIUI (bootloop) or not included at all
• 🔒 Device locked after failed bootloader unlock
• 🔍 Want to install custom firmware (e.g. Pixel Experience or LineageOS)

But there are pitfalls: inexperienced users often confuse firmware with factory reset or OTA updates. The former erases data but does not change the software version, and the latter installs only official patches, while firmware involves a complete reinstallation of the system with risks and consequences.

Preparation for firmware: 5 mandatory steps

Unprepared firmware is like an operation without an antiseptic. 90% of Redmi's "bricked" 9A They become so because they ignore this stage. Start by checking the current version. MIUI:

1. Go to Settings → About the phone → MIUI version
2. Remember or write down the build number (e.g. V12.0.1.0.QCDMIXM)

Then proceed to the checklist:

Download the official firmware from the Xiaomi website (choose the version for dandelion)|Charge your phone at least 60% (optimum 80%)|Make a backup copy through Settings → Additionally. → Backup|Install Mi drivers USB Driver on PC (link in official instructions)|Prepare. USB-Cable (original or certified)

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Pay special attention to unlocking the bootloader. On Redmi 9A, it is locked by default, and without unlocking you will not be able to flash the device through Fastboot.The process takes up to 72 hours (due to Xiaomi's policy) and requires an account to be linked to Mi Account.

Method 1: Firmware via MIUI Updater (without PC)

The safest method, but with limitations: suitable only for official stable versions of MIUI and does not allow you to downgrade the software version.

1. Download the firmware file (.zip) for your model (dandelion) to your phone.
2. Rename the file to update.zip (important!)
3. Move it to the root folder of internal memory (not in the Download or MIUI! folder).
4. Open the Update app (the icon with the arrow up).
5. Click on the three dots in the upper right corner → Select a firmware file.
6. Select update.zip and confirm the installation.

It takes 10-15 minutes. The device will restart several times — don't interrupt the process even if the screen goes out for 3-5 minutes. After successful firmware, reset settings through Settings → Reset to avoid conflicts between old and new software.

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If after firmware lost mobile Internet, check the settings APN. To do this, go to the Settings. → SIM-maps and mobile networks → Access points (APN) and select the operator manually.

Method 2: Firmware through Recovery (for experienced)

This method is suitable if the phone is turned on but cannot be updated through MIUI Updater (for example, due to corrupted system files) You will need custom recovery (for example, TWRP) Or the standard Mi Recovery.

Instructions for Mi Recovery:

1. Download the firmware (.zip) and rename it to update.zip.
2. Move the file to the root of the internal memory.
3. Turn off the phone, then press Power + Volume up to enter Recovery.
4. Select the language, then Install update.zip to System.
5. Confirm the installation and wait for completion.

For TWRP, the algorithm is similar, but with nuances:

• 🔧 Before the firmware, make a Wipe → Format Data (Erase Everything, Including Internal Memory!)
• 📁 Install firmware first, then (if necessary) Magisk for root rights
• ⚠️ Do not install firmware for other models – this will lead to hard brick (irreparable damage)

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Firmware through Recovery does not reset the data partition automatically. If you have errors after updating, run Wipe Data manually.

Method 3: Fastboot Firmware (for advanced)

The most powerful, but also the most risky method, which allows you to flash the device even if it's not turned on (soft brick), but requires a PC, unlocked bootloader and knowledge of the command line.

• 💻 Computer with Windows/Linux and installed drivers ADB/Fastboot
• 🔌 Original. USB-cable (cheap cables can interrupt the connection)
• 📄 Firmware in.tgz format (unpack it into a folder with fastboot)
• 🔓 Unlocked loader (see section “Preparation")

Step-by-step:

1. Turn off the phone and press Power + Volume down to log into the Fastboot.
2. Connect the device to the PC and check the connection command: fastboot devices (should display the serial number of the phone)
3. Go to the folder with the unpacked firmware and start the script: fastboot flash all (for Windows) or./flash_all.sh (for Linux/Mac)
4. Wait until the process is completed (the process will take 5-10 minutes).

If the script produces a FAILED error (remote: 'Flashing is not allowed'), then the bootloader is not unlocked. The solution is to repeat the unlock procedure through the Mi Unlock Tool.

⚠️ Note: Fastboot firmware erases all data, including files in internal memory.If you need to save photos or documents, remove the memory card (if any) before the process begins.

Table: Comparison of Redmi 9A firmware methods

Frequent Mistakes and How to Avoid Them

Even when following the instructions, users face problems.-5 mistakes and their solutions:

1. "Cannot load Android system" error: Reason: System partition or incompatible firmware is damaged. Solution: Fastboot flash all -w.
2. Phone is not defined in Fastboot: Reason: There are no drivers or faulty cable.Solution: Install Mi USB Driver, try another cable/USB port.
3. Bootloop after firmware: Reason: Conflict between old data and new firmware. Solution: Run Wipe Data in Recovery.
4. Anti-rollback error: Reason: Trying to downgrade MIUI below the acceptable version. Solution: Only run the newer version (check on Xiaomi Firmware Updater).
5. No network after firmware: Reason: Incompatibility of modem files.Solution: Sweat only the modem section through Fastboot: fastboot flash modem NON-HLOS.bin

⚠️ Note: If you have been running Redmi 9A Stop charging, check integrity USB-Often, when a cable is forced to shut down during firmware, the port fails, and repairs are required at the service center.

FAQ: Answers to popular questions