Is your Realme Narzo 90x 5G stuck in a bootloop, showing a blank screen, or running slow after a failed update? Fortunately, the best fix is to flash the official Stock ROM (firmware). Flashing Stock ROM restores your phone to its original factory state, and it fixes software issues, IMEI problems, and even dead phone situations.
In this guide, we will show you how to download the official Realme Narzo 90x 5G RMX5264 Stock Firmware and flash it step by step using SP Flash Tool on Windows. Whether you are a beginner or an advanced user, this guide is easy to follow. By the end, your phone should be running smoothly again.
This guide is specifically for Realme Narzo 90x 5G (Model: RMX5264) users who need to restore or reinstall the original firmware on their device.
What is Stock ROM?
Stock ROM is the original operating system that comes pre-installed on your Android device from the manufacturer. For the Realme Narzo 90x 5G, it is the official Android 15 software built by Realme. Flashing the Stock ROM means reinstalling this original software on your phone using a computer.
This is useful when your phone has a software problem that a normal restart cannot fix. Unlike a custom ROM, which is unofficial software made by third-party developers, Stock ROM is safe, stable, and supports all original features like OTA updates, Realme UI, and manufacturer warranty. Always use the correct firmware for your exact model number.
Requirements / What You Need
Before you start flashing, make sure you have everything ready:
- A Windows PC or laptop (Windows 7, 8, 10, or 11)
- Realme Narzo 90x 5G device (Model Number: RMX5264)
- Official Stock ROM firmware file (see download info below)
- SP Flash Tool installed on your PC — see our SP Flash Tool guide
- Original or good quality USB cable
- MediaTek (MTK) USB Driver installed on your PC
- At least 50% battery charge on your device
- At least 10 GB of free storage space on your PC
- WinRAR or 7-Zip to extract the firmware ZIP file
Step-by-Step Guide to Flash Realme Narzo 90x 5G Stock ROM
Follow these steps carefully to flash the Stock ROM using SP Flash Tool on your Windows PC.
Step 1: Download the Firmware and Tools
First, download the official Realme Narzo 90x 5G RMX5264 Stock ROM firmware package. The file is named Realme_Narzo_90x_5G_RMX5264_MT6835_EX_11_15.0.2.841EX01_260106_MXML.zip, and the file size is approximately 7.56 GB. Therefore, make sure you have a stable internet connection before you start.
Next, download SP Flash Tool on your Windows PC if you have not done so already. SP Flash Tool is the official flashing software for MediaTek chipset devices like the Realme Narzo 90x 5G. You can follow our detailed SP Flash Tool guide on this website for the complete setup instructions.
Step 2: Install the USB Driver
After downloading the tools, install the MediaTek USB Driver on your Windows PC. This driver allows your computer to detect your Realme device when connected via USB. Without the correct driver, SP Flash Tool cannot communicate with your phone. After installing the driver, restart your PC to make sure it takes effect properly.
Step 3: Extract the Firmware
Right-click the downloaded firmware ZIP file and extract it using WinRAR or 7-Zip. After extraction, you will find all the firmware files inside a folder. Look for the scatter file — it is usually named MT6835_Android_scatter.txt. Make a note of where this file is saved.
⚠️ Warning: Before flashing, back up all your important data including contacts, photos, videos, and app data. Flashing erases all data from your device completely, and this cannot be undone.
Step 4: Open SP Flash Tool and Load the Scatter File
Open the SP Flash Tool folder and right-click on flash_tool.exe. Then select “Run as Administrator” to launch it with the correct permissions. Once the SP Flash Tool interface opens, click the “Choose” button next to “Scatter-loading File”. Browse to the extracted firmware folder and select the scatter file. As a result, the firmware partition list will load automatically in the tool.
Step 5: Connect Your Phone and Start Flashing
Make sure your Realme Narzo 90x 5G is completely powered OFF before connecting it. Do NOT press the power button. Connect your phone to the PC with a USB cable. SP Flash Tool will automatically detect the MediaTek device, and you will see a yellow progress bar appear.
After detection, click the “Download” button in SP Flash Tool. The flashing process will start immediately. A blue progress bar will move across the screen. This process typically takes 10 to 20 minutes. Do NOT disconnect the phone or close SP Flash Tool during this time, because doing so could brick your device.
Step 6: Complete the Process
When flashing is complete, a green circle with a checkmark appears on the screen. This confirms that the Stock ROM is installed successfully. Disconnect your phone, then press the power button to turn it on. The first boot usually takes 5 to 10 minutes — this is completely normal, so be patient.
Common Errors and Fixes
1. “COM Port Not Found” Error
This error usually means the MediaTek USB Driver is not properly installed. Uninstall the driver, reinstall it, and try again. Additionally, make sure your phone is completely powered off before connecting it to the PC.
2. “Scatter File Not Found” Error
This happens when SP Flash Tool cannot find the scatter file. As a result, you need to make sure you have fully extracted the firmware ZIP before loading any files. The scatter file must stay in the same folder as all other firmware files.
3. Phone Not Detected by SP Flash Tool
Try using a different USB cable, since damaged cables are a common cause of this problem. Moreover, use a USB 2.0 port rather than USB 3.0 if possible. Reinstalling the MTK USB driver also often solves detection problems.
4. Phone Stuck on Boot Screen After Flashing
If your phone shows the Realme logo and does not boot, wait at least 10 minutes for the first boot. If it still does not boot after that, try reflashing the firmware from scratch. Make sure you selected the correct scatter file for model RMX5264.
FAQ
Q1: Is it safe to flash Stock ROM on Realme Narzo 90x 5G?
Yes, flashing the official Stock ROM is completely safe when done correctly. It restores your phone to its factory state using the manufacturer’s official software. However, it will erase all data on your phone, so always back up first.
Q2: Will flashing Stock ROM remove root access?
Yes. Flashing the Stock ROM removes root access, any custom recovery like TWRP, and all custom modifications. Your phone returns to its original out-of-the-box factory state, which is exactly what you need for a clean restore.
Q3: Do I need to unlock the bootloader to flash Stock ROM?
No. Unlike custom ROMs, you do not need to unlock the bootloader to flash the official Stock ROM using SP Flash Tool. The tool communicates directly with the MediaTek chipset to write the firmware to your device.
Q4: Which model number does this firmware support?
This firmware works specifically for the Realme Narzo 90x 5G with model number RMX5264. Do not use this firmware on any other Realme model, because the wrong firmware can permanently damage your device.
Conclusion
In this guide, we showed you how to download and flash the official Realme Narzo 90x 5G RMX5264 Stock ROM using SP Flash Tool on Windows. By following each step carefully, you can fix most software issues on your device, including bootloops, dead phone situations, and IMEI problems. The process is straightforward as long as you use the correct firmware for your specific model.
If you found this guide helpful, please share it with other Realme Narzo 90x 5G users who may face similar problems. Have questions or did you run into any issues during the flashing process? Drop a comment below, and we will be happy to help you out!