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Last Updated: February 25, 2026
Here’s how to download the latest official Infinix Note 40S X6850B firmware and fix your phone. This guide includes the necessary USB Driver, Infinix Flash Tool, and the Infinix Note 40S X6850B flash file to help you resolve any software glitches.
Infinix Note 40S X6850B Firmware (Flash File) – Drivers, Tools & Guide
We’ve gathered the original firmware for your Infinix Note 40S X6850B, along with the essential Infinix Flash Tool and MediaTek USB drivers you’ll need for flashing. All the files are zipped up, so you can extract them on your computer using software like WinRAR or 7-Zip. Make sure the extracted firmware package includes a scatter file; it’s crucial for the flashing process.
Before you start flashing your Note 40S X6850B, it’s a good idea to check that your downloaded zip files aren’t corrupted and that they actually match your specific Note 40S X6850B model. You’ll need a Windows computer and a USB cable to connect your phone. Also, it’s wise to scan your computer for malware before you begin flashing. When you’re ready, just follow our Step-by-Step Flashing Guide for simple instructions.
Updating the stock firmware on your Infinix phone can sort out a bunch of software problems. We’re talking about things like FRP lock, apps that keep crashing with messages like “unfortunately app has stopped,” slow performance, forgotten pattern locks, or if your phone is stuck on the Infinix logo and won’t boot up properly. It can also fix Wi-Fi and Bluetooth connection issues, battery drain problems, or if your phone has become soft-bricked.
Infinix Note 40S X6850B FRP Bypass
Sometimes, after you flash or reset your device, you might run into a Google account lock, also known as FRP. This usually happens if you forgot to remove your Google account before starting or if you’re using a device that someone else used before. Don’t worry, our free Android apps launcher can help you get past this lock quickly so you can access your device again.
Why Do We Need Infinix Note 40S X6850B Firmware?
Flashing a fresh stock firmware on your phone can bring several advantages:
- Fix Software Issues: It’s a great way to resolve app crashes, unexpected reboots, and general sluggishness.
- Unbrick Your Device: If your phone has become soft-bricked, flashing the correct firmware can bring it back to life.
- Enhance Performance: Sometimes, just reinstalling the firmware can give your phone a speed boost and make it feel more responsive.
- Security Updates: This ensures you have the latest features, bug fixes, and important security patches from Infinix.
- Restore Factory Settings: If you’ve been experimenting with custom ROMs, flashing the stock firmware lets you revert your phone to its original software state. You can learn more about stock rom here.
Choosing the Right Firmware Version
It’s super important to flash the correct firmware; flashing the wrong one could potentially brick your device. So, follow these steps carefully to make sure you pick the right one:
- Identify Your Device Model: Head to your phone’s settings, tap on “About Phone,” and confirm that you have the Infinix Note 40S X6850B variant.
- Check the Build Number: Look for specific identifiers like “X6850B” or something similar in your device information.
- Confirm Your Chipset: Based on Infinix specs, the Note 40S X6850B uses a Mediatek Helio G99 Ultimate CPU. This is an Octa-core processor (2×2.2 GHz Cortex-A76 & 6×2.0 GHz Cortex-A55) with a Mali-G57 MC2 GPU.
- Match the Firmware Version: Double-check that the firmware version and any regional details you find match your device’s specifications precisely.
- Not sure: If you’re still a bit fuzzy on your chipset and firmware version, you can try restarting your device into recovery mode. This often shows more device details.
Doing this helps you know exactly which Infinix Note 40S X6850B firmware to flash and which version is the best fit, reducing the risk of problems.
Firmware Details for Infinix Note 40S X6850B
| Firmware Information | Details |
|---|---|
| Device Model | Infinix Note 40S X6850B |
| Firmware Version | V681 |
| File Size | 6.7GB – 6.8G |
| Android Version | Android 14, up to 2 major Android upgrades, XOS 14 |
| Platform | Mediatek Helio G99 Ultimate CPU Octa-core (2×2.2 GHz Cortex-A76 & 6×2.0 GHz Cortex-A55) GPU Mali-G57 MC2 |
| Release Date | Released 2024, October |
| 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, and more) |
Download Infinix Note 40S X6850B Firmware
You can download the official stock firmware for your Infinix Note 40S X6850B using the links provided below. Just remember to always double-check that you’re selecting the firmware that perfectly matches your device model and its regional specifications.
| Software Details | Download Link | Members Link |
|---|---|---|
| File Name: Infinix_Note_40S_X6850B_MT6789_OP_V681_240529_MXML.zip Size: 6.7GB | Download Link | Download Link2 |
| File Name: X6850B-H895AaAiAm-U-OP-240529V681.zip Size: 6.8 GB | Download Link | Download Link2 |
Pre-Requirements for Flashing
Before you dive into the flashing process, make sure you have these essential tools and drivers installed on your PC:
First off, download and install the USB drivers listed below. This will help create a steady connection between your computer and your Infinix Note 40S X6850B, ensuring your PC can properly recognize and communicate with your phone during the firmware flashing.
| Require File | Download Link |
| Infinix Flash tool | Download Now |
| Infinix Mediatek Vcom USB Driver | Download Now |
| Windows 7-11 MTK VCOM USB Preloader Drivers | Download Now |
| ADB USB Driver for Infinix Note 40S X6850B | Download Now |
- Backup Your IMEI: Jot down and save your phone’s IMEI numbers. You can find them by dialing *#06# on your dialer.
- Remove Google Accounts: Make sure to log out of all your Google accounts. This is to prevent any FRP issues after flashing.
- Backup Your Data: Remember, flashing will wipe all data from your device. Back up your contacts, photos, and any other important files beforehand.
- Verify Compatibility: It’s crucial to confirm that the firmware you downloaded is for your specific Note 40S X6850B variant.
- Check Battery Level: Your device should have at least 50-70% battery charge. This prevents the flashing process from being interrupted, which could cause problems.
Step-by-Step Flashing Guide
Follow these steps carefully to flash your Infinix Note 40S X6850B and restore it to factory settings:
- Download and Extract Firmware Files
- First, download the firmware package using one of the mirror links we provided.
- Next, extract all the files on your computer. You should find the firmware itself, the USB drivers, the Infinix Flash Tool, and a user manual.
- Install USB Drivers
- Open the driver folder that came with the firmware package.
- Just follow the on-screen prompts to install the drivers. This lets your computer properly recognize your Infinix Note 40S X6850B.
- After installation is complete, restart your PC. This helps ensure the drivers load correctly.
- Launch Infinix Flash Tool
Navigate to the Infinix Flash Tool folder and run the application. Make sure to run it as Administrator.
In the tool, click on “Brower” (it means Browse). This file is what tells the flash tool exactly where to write each part of the ROM.
Now, find the scatter file within the firmware folder you extracted earlier.
- Start the Flashing Process
Make sure your device is powered off. Then, get ready to connect it to your computer using a USB cable.
In the Infinix Flash Tool, click the “Start” button. Then, connect your phone to your PC to kick off the flashing process.
Just wait for the process to finish. This can take a few minutes, so patience is key here.
You’ll see a green checkmark appear when the flashing process is successfully completed.
- Reboot and Set Up
- Disconnect your Infinix Note 40S X6850B from the computer and then power it on. The very first boot after flashing might take a bit longer than usual.
- Follow the on-screen prompts to set up your device. It’s now back to its factory settings.
Common Issues and Troubleshooting Tips
If you run into any snags during the flashing process, here are a few troubleshooting tips that might help:
- Device Not Recognized: Double-check that your USB drivers are installed correctly. You might also want to try a different USB port or cable.
- Flashing Errors in Infinix Flash Tool: Make sure you’ve selected the right scatter file and that your firmware download isn’t corrupted. Sometimes, simply downloading the file again can fix the problem.
- Boot Loop After Flashing: If your device gets stuck in a boot loop, try performing a factory reset from recovery mode, or you can try reflashing the firmware.
Missing IMEI or Corrupt Baseband?
If you find that your IMEI numbers are missing or the baseband is corrupt after flashing, follow these steps to sort it out:
- Install the Appropriate Driver: Download and install the MediaTek driver from the “Prerequisites” section above.
- Use a Write Tool: Tools like the SN Write Tool can help restore your IMEI.
- Enter Your Original IMEI: Open the tool, connect your device, and then carefully enter your original IMEI for both SIM slots.
- Begin the Write Process: Click the “Start” button and wait for the tool to finish its job.
- Restart and Verify: Once it’s done, restart your phone and check your IMEI by dialing *#06#.
Frequently Asked Questions (FAQs)
Q1: What if the Infinix Flash Tool shows an error during the process?
A: Make sure the scatter file you loaded is correct for your device model and that the firmware package is complete and not corrupted. Also, check the list of recommended tools we provided above.
Q2: Can I flash Infinix Note 40S X6850B firmware on a different Infinix model?
A: No, firmware is specific to each model. Using it on another model could cause serious problems.
Q3: Is this firmware compatible with other Infinix models?
A: No, this firmware is exclusively for the Infinix Note 40S X6850B. Using it on other models might lead to significant issues.
Q4: What should I do if I encounter an FRP lock after flashing?
A: You can use our Android apps launcher to help resolve any Google account lock issues.
Q5: Where can I download custom ROMs for the Infinix Note 40S X6850B?
A: You can explore our collection of custom ROMs here.
Q6: What if my phone gets stuck in recovery mode after flashing?
A: Try rebooting your device or repeat the flashing process using a fresh download of the Infinix Note 40S X6850B firmware. Ensure that the firmware file matches your build number, or you could try a newer version of the flash file.
Conclusion
Flashing the Infinix Note 40S X6850B firmware is a solid way to return your device to its original state. It can fix common software bugs, boost performance, and even unbrick a soft-bricked phone. With this guide and the files we’ve provided, you should be able to complete the process safely and efficiently. Just remember to follow each step carefully and double-check that you have the correct model and firmware version.
Restoring your Infinix Note 40S X6850B with its official firmware keeps it secure and stable, allowing you to enjoy the best performance Infinix intended. If you ever run into issues, check the user guide that came with the firmware package or join community forums for more assistance.
Stay in touch with us and join our community for more updates, tutorials, and support. You can also subscribe to our YouTube channel, LexzyTechinc, for helpful video guides.
Disclaimer: Flashing stock firmware is done at your own risk. Please follow the instructions precisely to avoid any potential damage to your device.
