Last Updated: July 30, 2026
If your Infinix Hot 20 5G X666 is stuck on a logo, locked out, or not responding, this guide walks you through the full recovery process with official firmware, the right flash tool, and clear instructions.
Device: Infinix Hot 20 5G X666 | Chipset: MediaTek Dimensity 810 (MT6833) | Flash Tool: SP Flash Tool
Android: Android 12, XOS 10.6 | 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 Hot 20 5G X666 (MediaTek Dimensity 810 (MT6833))
Flash Tool: SP Flash Tool
Latest Build: V1321
Firmware Files: 7 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 Hot 20 5G X666 Firmware (Flash File) Drivers, Tools & Guide
I have handled many Infinix phones, and the Hot 20 5G X666 is a common one. It usually arrives with FRP locks, bootloop issues, or stuck on the Infinix logo. This guide covers all of it. I have put everything you need in one place: the firmware, the tools, and the exact process I use myself.
One thing I always recommend before you start: extract the firmware to a simple folder path, something like C:FirmwareX666. SP Flash Tool can sometimes have trouble locating the scatter file if the folder path contains spaces or special characters. It is a small thing, but it saves a frustrating few minutes of wondering why the tool is not loading the file.
The Infinix Hot 20 5G X666 runs on a MediaTek Dimensity 810 (MT6833) chipset, which means you will use SP Flash Tool and VCOM/MTK drivers for flashing. These are included in the prerequisites below. This page lists 7 firmware builds for the Infinix Hot 20 5G X666, covering multiple Android versions and security patch levels. If one build does not work, try a different version. The Infinix Hot 20 5G X666 was originally released in 2022, which means USB driver compatibility on newer Windows versions (10/11) may require manual installation rather than plug-and-play.
With 7 firmware versions archived for the Infinix Hot 20 5G X666, this page covers multiple Android builds and security patch levels. As a Transsion Holdings brand, Infinix devices share similar chipset architectures and flashing procedures across the Hot 20 5G lineup.
Your Infinix Hot 20 5G X666 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.
Keep in mind that flashing stock firmware erases all data, which is intentional, as it resolves software issues including FRP lock, app problems, slow performance, forgotten pattern locks, a dead or logo-stuck device, Wi-Fi and Bluetooth issues, battery drain, and soft brick situations.
Infinix Hot 20 5G X666 FRP Bypass
The fastest way to bypass FRP on Infinix Hot 20 5G X666 is to use a free Android apps launcher that lets you access settings during the setup wizard. 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 Hot 20 5G X666
To factory reset Infinix Hot 20 5G X666 without a computer, power off the device completely, then hold Volume Up and Power at the same time until the recovery menu appears. 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 Hot 20 5G X666 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 Hot 20 5G X666 Model Before Downloading
The single biggest mistake I see people make is flashing firmware meant for a different variant. Before downloading anything, verify your exact device identity:
- Check About Phone: Open Settings and find your exact model number. It should read “X666”, not a similar name, the exact code.
- Match the Chipset: This firmware is built for MediaTek Dimensity 810 (MT6833). If your device has a different processor, it will not flash correctly.
- Look at the Build Number: The build string in your current software should reference the Hot 20 5G line. Cross-check it with the firmware table below.
- Check Recovery Mode: Power off, hold Volume Up + Power until recovery appears. The screen displays your chipset and current build, use this to confirm.
- Compare File Details: Make sure the version listed in the download table matches what you expect for your device and region.
Common Reasons to Reinstall Infinix Hot 20 5G X666 Firmware
The Infinix Hot 20 5G X666 uses a MediaTek chipset, and SP Flash Tool is the standard method for firmware recovery on MTK devices. Here is what flashing the stock firmware can help with:
- Remove persistent malware or adware that survives a factory reset.
- Resolve OTA update failures and battery drain issues.
- Fix startup loops, lagging, and freezing on your device.
- Clear a forgotten screen lock, PIN, or pattern without needing the original credentials.
- Repair a phone that shuts down randomly or restarts in a loop.
- 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 Hot 20 5G X666
Here is a quick overview of the official firmware specifications:
| Firmware Information | Details |
|---|---|
| Device Model | Infinix Hot 20 5G X666 |
| Firmware Version | V745, V1321, V1235, V1093, V854 |
| File Size | 3.5 GB to 3.76 GB |
| Android Version | Android 12, XOS 10.6 |
| Platform | MediaTek Dimensity 810 (MT6833) |
| Release Date | Released 2022, October 06 |
| 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?
This is the question I get asked most often in the comments, so I put together a simple guide. 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 | V1321, download this one. It is the latest Infinix Hot 20 5G X666 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 V1235, sometimes the latest OTA introduces new bugs and an older build runs better. |
| IMEI missing after a previous flash | Re-flash V1321 first, then follow the IMEI repair guide. Do not skip the reflash. |
| V1321 failed with a flash error | Try V1235 instead and double-check your scatter file selection before assuming the firmware is the problem. |
| Restoring to factory / warranty repair | V1321, 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 Hot 20 5G X666 Firmware
Download the official stock firmware for your Infinix Hot 20 5G X666 below. The latest available version is V1321. 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: Infinix_X666_MT6833_V745_220826.zip Size: 3.5 GB | Download Link | Download Link2 |
| File Name: X666-P740AEBC-S-GL-230221V1321.zip Size: 3.76 GB | Download Link | Download Link2 |
| File Name: X666-P740AEBC-S-GL-230116V1235.zip Size: 3.76 GB | Download Link | Download Link2 |
| File Name: X666-P740AEBC-S-GL-221129V1093.zip Size: 3.66 GB | Download Link | Download Link2 |
| File Name: X666-P740AEBC-S-GL-220921V854.zip Size: 3.62 GB | Download Link | Download Link2 |
| File Name: X666-P740AEBC-S-GL-220826V745.zip Size: 3.59 GB | Download Link | Download Link2 |
| File Name: X666-P740AEBC-S-GL-220826V745.zip Size: 3.6 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 Hot 20 5G X666 (X666) should not be confused with other Hot 20 5G variants that may have different chipsets or regional firmware. Even devices in the same Hot 20 5G line can use completely different processors. Always verify your exact model code “X666” in Settings > About Phone before downloading any firmware from this page.
- The model code on your phone must match X666 exactly. Even a single letter variant (like adding or dropping an “i” or “s”) can mean a different chipset inside.
- Your chipset should be MediaTek Dimensity 810 (MT6833). Recovery mode shows this information if you are not sure.
- Do not mix firmware from other download sites with the files on this page.
- If the downloaded file is much smaller than what is listed in the table above, re-download it, partial files will fail.
Prerequisites for Infinix Hot 20 5G X666 Firmware
Do not skip this section. Most failed Infinix flashes come from rushing through the preparation steps. The VCOM driver installation is essential for the Infinix Hot 20 5G X666 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.
- Save Your IMEI Numbers: Type *#06# in the phone dialer and note down both numbers. These are your device identifiers for the cellular network. If flashing wipes them, you will need the originals to write them back.
- Disconnect Google Accounts: Before you start anything, remove all Google accounts from the phone. Settings then Accounts then tap each Google account and remove it. This avoids the FRP verification screen that appears after flashing if accounts were still linked.
- Create a Backup: Copy your data to your computer or an SD card. Flashing replaces the entire software on the phone, which means all personal data, apps, and settings will be permanently deleted.
- Charge First: Get the battery above 50% before starting. The flashing process takes a few minutes and the first boot takes several more. A power failure during either stage can leave the device in a state that requires more advanced recovery.
- Prepare Your PC Connection: You need a Windows computer and a USB cable that supports data transfer. Test the cable first by connecting the phone normally, if it shows up in File Explorer, the cable is good.
- Install the Right Drivers:
Step-by-Step: Flash Infinix Hot 20 5G X666 Stock ROM
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 the Firmware Package:
- Use the download links in the table above to get the correct firmware file for your device.
- Extract the archive with WinRAR or 7-Zip. Use a short folder path like
D:flashto avoid issues with some tools.
- Check Drivers:
- All drivers from the prerequisites must be installed before connecting your device. Restart your computer after installing them.
- 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:
- Press “Download” to begin writing the firmware to your device.
- Do not unplug the phone, close the flash tool, or interact with the device until the process is 100% complete.
- Wait and Reboot:
- After the tool confirms the flash is complete, safely disconnect your phone.
- Press the power button to start your device. The initial boot is slow, wait up to 8 minutes before assuming there is a problem.
Infinix Hot 20 5G X666 Flashing Problems and Fixes
- Infinix Hot 20 5G X666 Not Recognized by SP Flash Tool:
- In most cases this is a driver issue, not a cable issue. Reinstall the VCOM drivers for the X666, 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.
What Is Normal After a Infinix Hot 20 5G X666 Flash?
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.
- Wi-Fi, Bluetooth, and mobile data should all work right after setup. If mobile data is not connecting, go to Settings, SIM and Network, and re-enter your APN manually, the flash sometimes clears carrier APN settings.
- Be careful when re-adding your Google account, if you did not remove it before flashing, you may see an FRP prompt. Add it fresh during the setup wizard, not afterwards through 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.
- All your apps are gone, this is expected. Reinstall them from the Play Store. If you had a Google account backup active, it will offer to restore your apps automatically during setup.
- 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.
- The phone will feel warm during first boot, this is normal. It settles after a few minutes once the initial app setup is complete.
Missing IMEI or Corrupt Baseband on Infinix Hot 20 5G X666 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
Common Questions About Flashing Infinix Hot 20 5G X666
Q1: Do I need an internet connection during flashing?
A: No. The flashing process is entirely offline, it happens between your PC and the phone via the USB cable. You do not need internet at any point during the flash itself. You will need internet later to set up the phone and download your apps.
Q2: How long does the flashing process take?
A: The actual flash usually takes between 3 and 10 minutes depending on the firmware size and USB connection speed. The first boot after flashing takes another 3 to 8 minutes. Do not interrupt the device during either stage. If the progress bar in SP Flash Tool appears stuck, give it a few more minutes before assuming something went wrong.
Q3: 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.
Q4: Can I use a Mac or Linux computer for this?
A: The tools and drivers referenced on this page are Windows-only. If you are on Mac or Linux, your best option is to use a Windows virtual machine, or borrow a Windows PC for the 10 minutes it takes to complete the flash.
Q5: What should I do if I encounter an FRP lock after flashing?
A: Use our free Android apps launcher. FRP lock activates when a Google account was still signed in before flashing. This is why signing out of your Google account before flashing avoids this issue entirely.
Q6: 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.
Q7: 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.
Q8: 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.
People Also Ask About Infinix Hot 20 5G X666
What chipset does the Infinix Hot 20 5G X666 use?
The Infinix Hot 20 5G X666 uses the MediaTek Dimensity 810 (MT6833) 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.
What is the latest firmware version for Infinix Hot 20 5G X666?
The latest available Infinix Hot 20 5G X666 firmware on this page is version V1321. This page has 7 firmware builds available for download. Check the firmware details table above for file sizes and Android versions.
Will flashing firmware on Infinix Hot 20 5G X666 erase my data?
Yes. Flashing stock firmware on the Infinix Hot 20 5G X666 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.
How do I check my Infinix Hot 20 5G X666 model number before flashing?
Go to Settings > About Phone on your Infinix Hot 20 5G X666 and look for the model number “X666”. You can also confirm by entering recovery mode (Volume Up + Power while powered off) which displays the build number and model code. Always match this exactly with the firmware filename before flashing.
Conclusion
That is everything you need to safely flash the official Infinix Hot 20 5G X666 firmware (V1321) using SP Flash Tool and get your device working again. If you followed each step, your phone should now be running on a clean build.
If something did not go as expected, a specific error, a step that is not working for your setup, leave a comment below with as much detail as you can: the exact error message, which step you are on, and what you have already tried. I read every comment and will help you work through it.
If this guide helped you, consider sharing it, it is the best way to help someone else who is dealing with the same problem.
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.
