Last Updated: August 20, 2026
This guide provides the official stock ROM, drivers, and steps to unbrick or bypass FRP on the Infinix Zero 20 X6821.
Device: Infinix Zero 20 X6821 | Chipset: MediaTek Helio G99 (MT6789) | Flash Tool: SP Flash Tool
Android: Android 12, XOS 12 | File Type: ZIP (Includes Scatter File [MT6xxx_Android_scatter.txt], preloader.bin, boot.img, system.img, recovery.img, lk.bin, logo.bin, nvram.img, and more)
⚠ Warning: Flashing erases all data. Back up first.
Device: Infinix Zero 20 X6821 (MediaTek Helio G99 (MT6789))
Flash Tool: SP Flash Tool
Latest Build: V1044
Firmware Files: 2 available
What You Need: Windows PC, USB data cable, SP Flash Tool, USB drivers
Time Required: 10-20 minutes (plus 3-8 min first boot)
Infinix Zero 20 X6821 Firmware (Flash File) Drivers, Tools & Guide
The Infinix Zero 20 X6821 comes in frequently with FRP locks, bootloops, or issues stuck on the logo. This guide covers everything needed to fix these problems. I have put the necessary files and steps in one place.
I recommend extracting the firmware to a simple folder, such as C:FirmwareX6821. SP Flash Tool can have trouble finding the scatter file if the path contains spaces or special characters. This simple step saves time.
Released in 2023, the Infinix Zero 20 X6821 has multiple firmware builds available, giving you options if one version causes issues. The device runs on a MediaTek Helio G99 (MT6789) chipset, which means you will use SP Flash Tool and VCOM/MTK drivers. There are 2 firmware files available for the Infinix Zero 20 X6821 on this page. Pick the one that matches your current Android version for the smoothest flash.
We verified firmware file integrity across 2 independent sources to confirm these are authentic, unmodified stock ROMs. The Infinix Zero 20 X6821 was released in 2023. This page is maintained with the latest available firmware builds as they become available.
Your Infinix Zero 20 X6821 firmware comes as a compressed ZIP file. Download and extract it using WinRAR or 7-Zip. Once extracted, open the folder and confirm it contains the scatter file before proceeding.
Once you flash, the device goes back to factory condition. Everything stored on the phone, photos, messages, apps, will be gone. This clean state is what allows the flash to fix stuck logos, FRP locks, software corruption, and performance issues.
Remove FRP Lock on Infinix Zero 20 X6821
Use a free Android apps launcher to bypass the Google account lock quickly after flashing or resetting. After flashing or performing a factory reset you may see a Google account lock (FRP). Our free Android apps launcher is the fastest way to get past it. This is also why I always recommend removing your Google account before flashing, it avoids this problem entirely.
Hard Reset Infinix Zero 20 X6821
Power off the device, then press Volume Up and Power together to enter recovery and wipe data. Use the volume keys to navigate to “Wipe Data/Factory Reset” and confirm with the Power button.
A hard reset erases all data and restores Infinix Zero 20 X6821 to its original factory state. This fixes most software problems, slow performance, app crashes, forgotten screen locks, and bootloops. If the issue persists after a factory reset, a full firmware flash using SP Flash Tool is covered in the following sections.
Verify Your Infinix Zero 20 X6821 Model Before Downloading
Verify your exact model code and chipset before downloading to avoid flashing the wrong file. Before downloading anything, confirm your device identity:
- Identify Your Device Model: Go to About Phone and confirm your model is Infinix Zero 20 X6821. Check the full model string, not just the name.
- Verify the Build Number: Look for the identifier “X6821” in your device build details.
- Confirm the Chipset: According to Infinix specifications, the Zero 20 X6821 runs on MediaTek Helio G99 (MT6789).
- Match the Firmware Version: Check the version and regional details against what is listed in the download table above.
- Verify in Recovery Mode: If you are not sure about the chipset or build number, boot into recovery mode, it displays this information clearly and is the most reliable way to confirm before you flash.
Why Do We Need Infinix Zero 20 X6821 Firmware?
Flash the stock firmware to restore the original system and fix most software glitches on the MediaTek Helio G99. Here is what flashing the stock firmware can help with:
- Clear a forgotten screen lock, PIN, or pattern without needing the original credentials.
- Restore the original Infinix stock ROM to keep your warranty valid.
- Fix startup loops, lagging, and freezing on your device.
- Resolve touchscreen responsiveness issues caused by a corrupted system build.
- Resolve OTA update failures and battery drain issues.
- Fix Wi-Fi, Bluetooth, or mobile data connectivity that stopped working after an update.
- Recover from “Download DA FAIL” errors and Secure Boot authentication issues specific to the MediaTek chipset in your device.
Learn more about stock ROMs and why flashing works.
Firmware Details for Infinix Zero 20 X6821
Here is a quick overview of the official firmware specifications:
| Firmware Information | Details |
|---|---|
| Device Model | Infinix Zero 20 X6821 |
| Firmware Version | V947, V1044 |
| File Size | 4.1 GB to 5.03 GB |
| Android Version | Android 12, XOS 12 |
| Platform | MediaTek Helio G99 (MT6789) |
| Release Date | Released 2023, January 02 |
| Region | Global, Africa and Asia |
| File Type | ZIP (Includes Scatter File [MT6xxx_Android_scatter.txt], preloader.bin, boot.img, system.img, recovery.img, lk.bin, logo.bin, nvram.img, and more) |
Which Firmware Version Should I Download?
Use the table below to match your specific issue with the correct firmware file. Find your situation in the table and go straight to the right file:
| Your Situation | What I Recommend |
|---|---|
| Phone is completely dead or stuck on logo | V1044, download this one. It is the latest Infinix Zero 20 X6821 firmware available. |
| FRP / Google account lock only | See the FRP bypass guide above, you likely do not need the full firmware for this. |
| Phone slow after a recent OTA update | Try V947, sometimes the latest OTA introduces new bugs and an older build runs better. |
| IMEI missing after a previous flash | Re-flash V1044 first, then follow the IMEI repair guide. Do not skip the reflash. |
| V1044 failed with a flash error | Try V947 instead and double-check your scatter file selection before assuming the firmware is the problem. |
| Restoring to factory / warranty repair | V1044, clean state, fresh start. |
My general approach with MTK devices: always try the latest version first. I have seen people spend a lot of time trying older builds when the newest one would have worked fine. Only move to an older version if the latest fails more than once, and make sure it is a driver issue you are solving, not a firmware issue.
Download Infinix Zero 20 X6821 Firmware
Download the official stock firmware for your Infinix Zero 20 X6821 below. The latest available version is V1044. After downloading, verify the file size matches the table above, a size mismatch usually means a partial or corrupt download, and flashing a corrupt file can cause more problems than it solves.
| Software Details | Download Link | Members Link |
|---|---|---|
|
File Name: X6821-H891K-S-RU-220922V947.zip Size: 4.1 GB | Download Link | Download Link2 |
| File Name: X6821-H891JK-S-GL-221011V1044.zip Size: 5.03 GB | Download Link | Download Link2 |
Only download firmware that is fully compatible with your exact device model. See the firmware selection guide above if you are not sure.
Important: The Infinix Zero 20 X6821 (X6821) should not be confused with other Zero 20 variants that may have different chipsets or regional firmware. Even devices in the same Zero 20 line can use completely different processors. Always verify your exact model code “X6821” in Settings > About Phone before downloading any firmware from this page.
- Your model number is a variant of X6821 with a different letter suffix. Check About Phone carefully, one letter difference can cause a failed or broken flash.
- Your chipset differs from MediaTek Helio G99 (MT6789). Confirm in recovery mode before proceeding.
- You downloaded the file from a source other than this page.
- The file size differs significantly from the sizes listed in the table above, a size mismatch usually means a partial download, which will fail mid-flash.
Before You Start: Infinix Zero 20 X6821 Requirements
Ensure your PC has the correct VCOM drivers installed and your phone is charged before starting. Most failed Infinix flashes come from rushing through the preparation steps. The VCOM driver installation is essential for the Infinix Zero 20 X6821 and other MediaTek devices. Windows may show the device in Device Manager and SP Flash Tool will still not detect it if the correct VCOM driver is not installed.
- Back Up IMEI Numbers: Dial *#06# and write down both IMEI numbers now. You will need these if you need to restore your IMEI after flashing.
- Remove Google Accounts: Sign out of all Google accounts to prevent FRP lock after flashing.
- Back Up Your Data: Back up everything, photos, contacts, WhatsApp chats, important files. Flashing wipes the device completely.
- Charge Your Device: At least 50% battery. A device that powers off during a flash is very difficult to recover.
- USB Cable & PC: Use a proper data USB cable, not a charge-only cable, and a Windows computer with available USB ports.
- Install Required Drivers:
How to Install Firmware on Infinix Zero 20 X6821
Connect the device to SP Flash Tool and load the scatter file to begin the flashing process. We are using SP Flash Tool for this. For older devices, I recommend trying SP Flash Tool v5.1924 first. The newer versions of SP Flash Tool require a DA (Download Agent) file that older firmware packages do not include, and that is what causes the “Auth” errors you may have seen. If SP Flash Tool keeps asking for an auth file and you do not have one, switch to MTK Client, it handles Secure Boot automatically. Download SP Flash Tool for Windows or SP Flash Tool for Linux and follow the steps below. The complete SP Flash Tool guide is also available if you need more detail.
- Download and Extract:
- Download the correct firmware package from the links above.
- Extract the ZIP to a simple folder path, avoid paths with spaces or special characters, as some flash tools have trouble with them.
- Install the Listed Drivers:
- Confirm all drivers listed above are installed and that your PC has been restarted since installation. Skipping the restart is a common reason drivers do not work correctly.
- Load the Firmware File:
- Click on the “Scatter-loading” button. Navigate to the folder where you extracted the firmware and select the “scatter.txt” file.
- Connect Your Device:
- Power off your phone completely, not sleep mode, fully off.
- Connect to your PC via USB cable. The flash tool will detect it automatically.
- Start Flashing:
- Click the “Download” button to begin.
- Do not disconnect, move the cable, or touch the device until the process is fully complete. Disconnecting mid-flash is how devices get bricked.
- Wait and Reboot:
- Once flashing finishes successfully, disconnect the device.
- Power on your device. The first boot will take longer than usual, give it up to 8 minutes.
What to Do if Infinix Zero 20 X6821 Flash Fails
- Infinix Zero 20 X6821 Not Recognized by SP Flash Tool:
- In most cases this is a driver issue, not a cable issue. Reinstall the VCOM drivers for the X6821, restart your PC, and try again before changing anything else.
- If that does not work, switch to a USB 2.0 port, USB 3.0 ports can cause detection issues with MediaTek devices more often than people expect.
- Still not working? Temporarily disable your antivirus. It can block the VCOM driver from loading without giving you any error message.
- Boot Loop After Flashing:
- Enter recovery mode and perform a factory reset from there. Most post-flash bootloops on MediaTek are caused by conflicts with old cached data, a wipe from recovery usually fixes this without needing to reflash.
- Wrong Scatter File / Firmware Mismatch:
- If SP Flash Tool throws an error as soon as you try to start the download, check your scatter file first. A mismatch between the scatter file and your device build is one of the most common causes of flash errors.
- “Download DA FAIL” Error:
- This error comes up regularly. It almost always means the VCOM driver is not properly installed. Reinstall it, restart your PC, and try again. If that still does not work, try switching to SP Flash Tool v5.1924, older devices sometimes respond better to the older version.
- Error 8038 (BROM Error):
- The device is not entering BROM mode correctly. Power it off completely and, if possible, remove the battery for 30 seconds. Reconnect and try again. Some MediaTek devices require you to hold Volume Down while plugging in the USB cable to enter BROM mode.
- Auth File / Secure Boot Error in Newer SP Flash Tool:
- Newer versions of SP Flash Tool require a DA (Download Agent) authentication file for devices with Secure Boot enabled. If you do not have that file, switch to MTK Client instead, it handles Secure Boot automatically and is the simpler solution.
Post-Flash Behavior on Infinix Zero 20 X6821
Expect a longer first boot time and check your IMEI immediately after setup. Here is what is completely normal after a successful flash:
- How to know the flash was successful: SP Flash Tool will show a green circle or checkmark when done. If you see that, the flash completed successfully.
- Storage will show almost full capacity available since all your apps and files are gone. The system partition size varies by firmware version but is typically 4 to 8 GB on most devices.
- Dial *#06# immediately after setup to check your IMEI. Do this before you insert a SIM card. If it shows “unknown” or “null”, follow the IMEI repair guide below before doing anything else.
- Battery percentage may seem inaccurate for the first day. The battery statistics are calibrated during normal use. Charge the phone fully once without interruption and the readings will stabilize.
- The phone will feel warm during first boot, this is normal. It settles after a few minutes once the initial app setup is complete.
- Notification sounds and ringtones will be back to factory defaults. Any custom tones you had set before will need to be re-downloaded and re-assigned in Settings.
- Stuck in a bootloop after first boot? Enter recovery mode and do a factory reset from there, see the hard reset guide above. This can happen occasionally and does not mean the firmware is wrong.
Missing IMEI or Corrupt Baseband on Infinix Zero 20 X6821 After Flashing?
A missing or unknown IMEI is one of the most common things I see after a MediaTek flash. It happens because the NVRAM partition, which stores your IMEI and calibration data, sometimes does not survive the flash intact. It looks alarming, but it is fixable. Here is what to do:
- Check your drivers first: Install the Mediatek CDC Driver if you have not already, without it, the IMEI repair tools will not detect your device. This is the step most people miss.
- Use SN Write Tool or Maui Meta: SN Write Tool is the first option I try, it is straightforward and works on most MTK devices. Maui Meta is the alternative if SN Write does not connect. You can learn more about using SN Write Tool here.
- Run the repair:
- Connect your device to the computer.
- Enter the original IMEI numbers for both SIM slots, these are the numbers you wrote down before flashing.
- Click “Start” and let it complete without interrupting the connection.
- Verify after reboot: Once done, reboot your phone and dial *#06#. Your IMEI numbers should be back. If they are still showing null, run the process again, sometimes the first attempt does not complete correctly.
Video Guide: How to repair IMEI
Credits: https://www.youtube.com/@mhgsmclinic
Frequently Asked Questions
Q1: Is this firmware compatible with other Infinix models?
A: No. This firmware is built specifically for the Infinix Zero 20 X6821 running on the MediaTek Helio G99 (MT6789) chipset. Even variants of the Zero 20 with a different letter suffix can have a completely different chipset inside. Flashing the wrong firmware can leave your phone in a state that is very difficult to recover from. Always check your exact model number in Settings.
Q2: My device is not detected by SP Flash Tool. What should I do?
A: Start with the drivers, reinstall the VCOM drivers, restart your PC, then try again. Switch to a USB 2.0 port if you are on USB 3.0. Disable your antivirus temporarily. If none of that works, leave a comment with the exact error message.
Q3: How do I enter recovery mode?
A: Power the device off completely, then hold Volume Up + Power at the same time until the recovery menu appears. The recovery menu displays the build number which you can use to verify your firmware version before flashing.
Q4: What if the flash fails halfway through?
A: Do not panic and do not disconnect the phone. Close SP Flash Tool, restart it, and try the flash again from the beginning. In most cases, a failed flash just means the process needs to be repeated. The device is usually still detectable by the flash tool even after a failed attempt.
Q5: Will flashing void my warranty?
A: Flashing official stock firmware generally does not void your warranty since you are restoring the device to its factory-intended state. However, some manufacturers may flag that the bootloader was unlocked or that the flash counter increased. Check your specific warranty terms with Infinix support if you are concerned.
Q6: My IMEI shows “unknown” after flashing. Is my phone permanently damaged?
A: No, it looks alarming, but it is fixable. Follow the IMEI repair guide in the troubleshooting section above. For MediaTek devices, SN Write Tool or Maui Meta will handle the repair. Do not insert a SIM card until the IMEI is restored.
Q7: Is it safe to flash during a power outage risk?
A: It is best to avoid flashing during unstable power conditions. If your PC shuts down during the flash, it can corrupt the write and leave the phone in an unbootable state. If you are in an area with unreliable power, use a laptop with a fully charged battery instead of a desktop.
Q8: Can I flash this firmware if my phone does not turn on at all?
A: Yes, in most cases. As long as the phone responds to a USB connection (even with a black screen), the flash tool can detect it. If the battery is completely drained, charge it for at least 15 minutes first.
People Also Ask About Infinix Zero 20 X6821
What is the latest firmware version for Infinix Zero 20 X6821?
The latest available Infinix Zero 20 X6821 firmware on this page is version V1044. This page has 2 firmware builds available for download. Check the firmware details table above for file sizes and Android versions.
Can flashing firmware fix a bricked Infinix Zero 20 X6821?
Yes. If your Infinix Zero 20 X6821 is stuck on the logo, in a bootloop, or will not turn on, flashing the stock firmware with SP Flash Tool can restore it to working condition. This is the standard repair method used by service centers for Infinix devices.
Will flashing firmware on Infinix Zero 20 X6821 erase my data?
Yes. Flashing stock firmware on the Infinix Zero 20 X6821 with SP Flash Tool performs a full factory reset. All apps, photos, contacts, and accounts will be removed. Back up everything important before you start. There is no way to recover data after flashing.
What chipset does the Infinix Zero 20 X6821 use?
The Infinix Zero 20 X6821 uses the MediaTek Helio G99 (MT6789) chipset, a MediaTek processor. This means you need SP Flash Tool and VCOM/MTK USB drivers to flash firmware. MediaTek devices use scatter-file-based flashing, which is different from Qualcomm (QFIL) or Samsung (Odin) methods.
Wrapping Up: Infinix Zero 20 X6821 Firmware
Your Infinix Zero 20 X6821 should now be running V1044 on a clean build. If the first boot takes a while, do not worry, that is completely normal after a fresh flash.
Ran into something unexpected? Leave a comment and describe what happened. Include which step you were on and what error you saw. I will get back to you.
Consider sharing this guide with anyone else who has a Infinix device that needs fixing.
Browse all Infinix firmware downloads for more devices.
Disclaimer: Flashing stock firmware is performed at your own risk. Follow the instructions on this page carefully. I cannot be held responsible for any damage to your device, but I will always try to help if something goes wrong.
