Infinix Note 40 Pro Plus 5G (X6851B) Stock Firmware ROM (Flash File) DOWNLOAD and GUIDE

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Introduction

The Infinix Note 40 Pro Plus 5G (Model: X6851B) is a high-end smartphone from Infinix, known for its sleek design, curved AMOLED display, wireless charging, and smooth performance powered by the MediaTek Dimensity 7020 5G processor. It runs on the latest Android 14 with Infinix’s XOS skin, making it both modern and feature-packed.

However, like any Android device, it can experience software issues such as boot loops, corrupted system files, failed OTA updates, or soft brick scenarios. In such cases, flashing the official stock firmware (flash file) is the best solution to restore the phone to working condition.

In this article, you’ll find a complete guide to the Infinix Note 40 Pro Plus 5G X6851B firmware, including its benefits, technical specs, flashing requirements, and step-by-step installation instructions.

What Is Stock Firmware?

Stock firmware (also known as stock ROM or flash file) is the original software package provided by the device manufacturer — in this case, Infinix — for a specific model. It includes:

  • The Android operating system

  • Infinix’s XOS user interface

  • System apps and drivers

  • Core boot, recovery, and system image files

Flashing this firmware can restore the phone to factory settings, fix boot errors, and remove software-related problems caused by system corruption or unsuccessful modifications.

Why Flash the Infinix Note 40 Pro Plus 5G Firmware?

Flashing the X6851B stock ROM may be necessary in the following situations:

🔁 Stuck on boot screen or boot loop
🧱 Soft-bricked due to failed rooting or custom ROM
🔒 Locked device (forgotten PIN, password, or pattern)
⚠️ Malfunctioning software or frequent app crashes
🆙 Manual upgrade or downgrade of Android firmware
🔄 Remove or bypass FRP lock (Google account verification)
📶 Fixing invalid IMEI, no network, or baseband issues

Infinix Note 40 Pro Plus 5G (X6851B) Firmware Information

Property Details
Device Name Infinix Note 40 Pro Plus 5G
Model Number X6851B
Android Version Android 14
XOS Version XOS 13.5 / XOS 14
Processor (SoC) MediaTek Dimensity 7020 (MT6835)
Firmware Type Official Stock ROM
Firmware Format Scatter File (.txt)
Flash Tool Needed SP Flash Tool
File Size Approximately 4 – 5 GB

⚠️ Important: Only flash firmware that matches the exact model number X6851B. Using the wrong firmware may brick the device permanently.

Before You Begin – Requirements

Before flashing, make sure you have:

  • A Windows PC or laptop

  • The extracted Infinix X6851B firmware package

  • SP Flash Tool (Smart Phone Flash Tool)

  • MediaTek USB VCOM drivers installed

  • Original or reliable USB cable

  • Battery charged to at least 60%

  • A backup of all important data (flashing erases everything)


👇 𝗖𝗹𝗶𝗰𝗸 𝗛𝗲𝗿𝗲 𝗧𝗼 𝗗𝗼𝘄𝗻𝗹𝗼𝗮𝗱

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How to Flash Infinix Note 40 Pro Plus 5G (X6851B) Stock Firmware

⚠️ Disclaimer:
Flashing stock firmware incorrectly can damage your device. Proceed carefully and only if you’re confident in the process.

🔧 Flashing Instructions

Step 1: Download & Extract Firmware

  • Unzip the firmware package on your PC

  • Locate the scatter file: MT6835_Android_scatter.txt

Step 2: Install USB Drivers

  • Install the MediaTek USB VCOM Drivers on your PC

  • Restart your computer after installation

Step 3: Launch SP Flash Tool

  • Open SP Flash Tool as Administrator

  • Click on “Scatter-loading” and select the .txt scatter file

Step 4: Load and Configure Firmware

  • SP Flash Tool will auto-load the firmware components

  • Choose Download Only mode

  • (Optional) Uncheck Preloader to prevent hard brick if you're unsure

Step 5: Connect the Device

  • Power off the phone completely

  • Click the Download button in SP Flash Tool

  • Connect your phone via USB cable (hold Volume Down or Up if necessary)

  • Flashing will begin automatically

Step 6: Wait for Flash Completion

  • The flashing process may take several minutes

  • Once complete, a green checkmark (“Download OK”) will appear

Step 7: Reboot the Device

  • Disconnect the phone and power it on

  • The first boot may take up to 10 minutes — this is normal

After Flashing

After a successful flash:

  • Complete the device setup (language, Wi-Fi, Google account, etc.)

  • Check core functions: touchscreen, calls, camera, audio, Wi-Fi, etc.

  • Dial *#06# to confirm that IMEI is restored

  • Update apps or system software if needed

Common Flashing Errors & Fixes

Problem Solution
Device not detected Reinstall MediaTek VCOM drivers; use another USB port
Flash stuck at 0% Reload scatter file, restart SP Flash Tool
Authentication or DA error Use a compatible DA/auth file or alternate tool
IMEI lost or invalid Restore using SN Writer or Maui META Tool
Bootloop after flash Perform factory reset via recovery mode

Tips & Precautions

✅ Confirm your device model is X6851B before flashing
🔌 Avoid disconnecting the phone during flashing
🧠 Use Download Only mode unless full formatting is required
🔐 Some firmware may automatically reset or bypass FRP
🧰 Always back up IMEI/NVRAM data if possible


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