Xiaomi Redmi S2 / Y2 Firmware Flash File Download [Stock ROM]
The Redmi S2 / Y2 (codenamed ysl) was Xiaomi’s selfie-centric budget smartphone, renowned for its 16MP front camera, Snapdragon 625 reliability, and sleek design. If your device is experiencing camera malfunctions, performance lag, battery drain, or software instability, this guide provides the official MIUI fastboot ROMs needed for a complete system restoration.
Important Notice: Verify your device codename is ysl before flashing. This device is also known as Redmi S2 in some markets and Redmi Y2 in India. Flashing incorrect firmware will result in a non-functional device.
Quick Device Specifications
- Device: Redmi S2 / Redmi Y2 (ysl)
- Release Year: 2018
- Chipset: Qualcomm Snapdragon 625 (14nm)
- Display: 5.99″ IPS LCD, 720 × 1440 pixels (18:9)
- Camera: 12MP + 5MP dual rear, 16MP front camera
- Battery: 3080 mAh
- Original OS: Android 8.1 Oreo, MIUI 9
Essential Downloads & Tools
| File / Tool | Download Link |
|---|---|
| Xiaomi Mi Flash Tool | Download Stable Version |
| Qualcomm USB Drivers | Download Latest Drivers |
| ADB and Fastboot Tools | Official from Google |
| Mi Unlock Tool | Bootloader Unlock |
Official Fastboot ROM Collection
| Region / Variant | Build Version | Android | Release Date | Download Link |
|---|---|---|---|---|
| China Stable | V12.0.4.0.PEFCNXM | 9.0 | 2020-07-29 | Download |
| Global Stable | V12.0.2.0.PEFMIXM | 9.0 | 2020-09-24 | Download |
| Russia Stable | V12.0.1.0.PEFRUXM | 9.0 | 2020-12-09 | Download |
| Xiaomi.eu (Custom) | V12.0.4.0.PEFCNXM (Based) | 9.0 | — | Download |
Flashing Guide for Redmi S2/Y2 (ysl)
- Driver Installation: Install Qualcomm USB drivers on your computer before connecting the device.
- Bootloader Unlock: If flashing a different region ROM, unlock bootloader first using Mi Unlock Tool (requires Mi account authorization and waiting period).
- Enter Fastboot Mode: Power off device, then hold Volume Down + Power buttons until Fastboot logo appears.
- Flash Process:
- Extract the downloaded .tgz file to access the firmware folder
- Open Mi Flash Tool and browse to the extracted folder
- Select “Clean All” option for a fresh installation (recommended for troubleshooting)
- Click “Flash” and wait for the process to complete (typically 3-5 minutes)
- First Boot: Initial boot may take 5-10 minutes as the system optimizes applications.
Frequently Asked Questions (FAQs)
Q1. Why is my 16MP front camera not working properly after an update?
The high-resolution front camera requires specific firmware calibration. Flash the complete stock ROM using the “Clean All” option to restore proper camera functionality and calibration data. This often resolves focus and image quality issues.
Q2. Can I upgrade to Android 10 or higher on Redmi S2/Y2?
No, Android 9 Pie was the final official Android version for this device. The Snapdragon 625, while capable, was not provided with further Android version updates by Xiaomi due to product cycle constraints.
Q3. Which ROM is best for battery life on this device?
The Global V12.0.2.0.PEFMIXM generally offers the best balance of performance and battery optimization for international users. The Snapdragon 625 is known for its efficiency, and this ROM version is well-tuned for it.
Q4. My device is experiencing network signal drops. Can flashing help?
Yes, network issues are often related to modem firmware. Flashing the complete stock ROM for your region will refresh the modem partition and can resolve many connectivity problems, including signal drops and slow data speeds.
Device-Specific Troubleshooting
- Camera Focus Issues: After flashing, perform a camera calibration through the hardware test menu (*#*#6484#*#* → Camera Test) to ensure optimal performance.
- Battery Drain: The 3080mAh battery benefits from calibration after flashing. Charge to 100%, drain completely, then charge to 100% again without interruption.
- Performance Lag: The 3GB RAM model can benefit from using the “Lite” mode in settings after flashing to reduce memory usage.
- Storage Management: With 32GB/64GB options, consider using the Files app to clean junk files after flashing to maximize available space.
