Realme 12 5G RMX3999 Firmware Flash File (Download Stock ROM)

This page will guide installing the official stock Firmware flash file on your Realme 12 5G RMX3999. The device is based on Android 14, which the MediaTek processor powers. This guide will be helpful to unbrick or fix any software issues on your device.

To install the firmware flash file on Realme 12 5G RMX3999, you need to download the SP Flash tool. This method is simple and easy. We have also added video and step-by-step tutorials to make things easier to flash the firmware file.

Realme 12 5G Device Overview:

The Realme 12 5G, released in March 2024, is a mid-range smartphone that offers solid performance and 5G connectivity at an affordable price. It features a 6.72-inch IPS LCD display with a 120Hz refresh rate and up to 950 nits of brightness in High Brightness Mode (HBM). The display’s resolution of 1080 x 2400 pixels provides a sharp viewing experience, and the device boasts an 86.5% screen-to-body ratio.

Realme 12 5G powered by the MediaTek Dimensity 6100+ chipset, the phone is equipped with an octa-core CPU and Mali-G57 MC2 GPU, delivering reliable performance for everyday tasks and moderate gaming. It runs on Android 14 with Realme UI 5.0 and offers three memory configurations: 128GB with 6GB or 8GB RAM, and 256GB with 8GB RAM, with the option to expand storage via a microSDXC card using the shared SIM slot.

Photography on the Realme 12 5G is handled by a dual-camera setup, headlined by a 108 MP wide sensor with PDAF for high-resolution images, alongside a 2 MP depth sensor for portrait shots. The 8 MP front camera is suitable for selfies and video calls, both cameras capable of recording 1080p video at 30fps. The phone includes stereo speakers and a 3.5mm headphone jack with Hi-Res audio support, enhancing the audio experience.

Connectivity features include dual-band Wi-Fi, Bluetooth 5.2, and comprehensive positioning systems, though NFC and radio are absent. The device is IP54-rated for dust and splash resistance, adding durability. It is powered by a 5000 mAh battery that supports 45W wired charging, capable of reaching 50% in 30 minutes, making it a dependable option for users who need a balance of performance, camera quality, and battery life.

Advantages of Stock ROM:

Here are the answers to why you need to download and save the Realme 12 5G Stock ROM flash file on your computer.

• If your device is dead, you can unbrick using the Stock ROM file
• You can fix or repair the IMEI on your device using DB files from Stock ROM
• Remove any malware or adware from Realme 12 5G
• You can fix the boot loop issue on Realme 12 5G
• Fix Unfortunately, the app has stopped errors on Realme 12 5G
• Fix Network related issue
• Patch Boot image to Root using Magisk: Mediatek Guide or Spreadtrum Guide
• You can unroot Realme 12 5G
• To Reset or Remove FRP on your device: Mediatek FRP Guide or Spreadtrum FRP Guide
• Restore Realme 12 5G to Factory State

Steps to Install Stock Firmware on Realme 12 5G RMX3999

Before we get straight to the Steps to install stock firmware on Realme 12 5G RMX3999, let us look at some of the prerequisites.

Pre-Requirements:

• Supported device: Realme 12 5G RMX3999
• Make sure to charge your device more than 50%
• You need a PC or Laptop with a USB cable.
• Take a complete backup using any method given below
  • Full Data Backup without Root
  • Nandroid Backup via TWRP
• Download Drivers and Tools: VCOM drivers, SP Flash Tool, and Realme USB Drivers

Download Flash Files

Software Version	Download Link
Flash File Name: Realme_12_5G_RMX3999_MT6835_EX_11_14.0.1.501EX01_240228_MXML File Size: 6.11 GB	Download

Method 1: Instructions to Install via Recovery:

First, you can try the official method to install the OTA stock ROM update via Realme device recovery.

Method 2: Instructions to Install via SP Flash Tool

Now, without wasting any more time, let’s jump into the firmware installation steps below:

1. Make sure you follow and download all the required files and flash tools on your PC.
2. Open the flash tool exe file to open the SP Flash Tool User Interface
3. Once your load the SP Flash tool UI, Tap on the Download option
   
4. In the download tab, you have to load both the download agent and the scatter text file in the scatter-loading section.
   
5. You will find the scatter text file inside the ROM package for most cases, if not, you can create a scatter text file on your own.
6. Once you load the file, click the Download button
7. To start the upgrade process of stock ROM on your Realme 12 5G, you need to turn off your device and hold the Volume Down and Volume Up keys together and Connect your Phone to your PC/Laptop using a USB Cable (Keep the Volume Down and Volume Up button until your computer detects the phone.)
8. When the phone connects, your device will start upgrading the stock firmware
9. You need to wait for a few minutes to complete the upgrade process.
10. Once the flashing process completes, you will find a green button which means a successful upgrade.
11. That’s it! You can reboot your Realme 12 5G

Follow our full-depth video guide below

So that’s it guys, this was our take on How to flash the firmware file on Realme 12 5G. We hope that you found this post useful. Let us know what you guys think about it in the comments section down below.