The Positivo One S420 is a compact budget smartphone released in early 2016, featuring a dual-SIM setup and small 4-inch display, but widely criticized for poor performance, low specs, and weak battery life. Users frequently report severe lag and freezing, bootloop after updates, slow startup, app crashes, unresponsive touchscreen, overheating, and rapid battery drain.
Additional complaints include “no service” on SIM cards, Wi-Fi connectivity issues, camera failures, forgotten password locks, and inability to boot after failed updates or rooting attempts. Flashing the stock firmware below fully restores your One S420, fixes system corruption, removes access locks, and returns it to working condition.
Positivo One S420 Firmware Details
| Device Name: | Positivo One S420 |
| Model: | S420 (also “Positivo One Dual Chip”) |
| Chipset: | MediaTek MT6572 (Dual-core 1.3GHz Cortex-A7) |
| GPU: | ARM Mali-400 |
| Android Version: | Android 5.1 Lollipop |
| Firmware Version: | 5.1 |
| Build Date: | 2016/early 2017 (estimated) |
| File Size: | 716MB |
| File Type: | Scatter Firmware (SP Flash Tool) |
| Flashing Tool: | SP Flash Tool (for MTK) |
| Display: | 4.0-inch TFT LCD, 480×800 pixels |
| RAM / Storage: | 512MB RAM / 8GB ROM (limited, microSD up to 32GB) |
| Rear Camera: | 3.1MP autofocus, LED flash |
| Front Camera: | 1.3MP (VGA) |
| Battery: | 1300mAh Li-Ion (removable) |
| SIM: | Dual SIM (micro) |
| Other Features: | 3G/2G, Wi-Fi, Bluetooth 4.0, FM radio, 3.5mm jack |
Download Official Firmware for Positivo One S420
This ROM recovers dead or bricked phones, fixes severe lag, removes password locks, solves bootloop, and restores all system functionality to factory standards. Use it after failed root attempts, custom ROM, or system corruption.
📄 Filename: Positivo_One_S420_MT6572_5.1.zip
📦 Size: 716MB
🗓️ Build Date: Early 2016/2017
🔢 Build Version: 5.1
🤖 Android Version: 5.1 Lollipop
⬇️ Download Link: MediaFire
How to Flash the Firmware
Follow these 5 quick steps to safely flash Positivo_One_S420_MT6572_5.1.zip to your phone:
- Download and extract the firmware ZIP and SP Flash Tool on your PC.
- Install MediaTek USB drivers and open SP Flash Tool.
- Load the scatter file from the extracted firmware folder into SP Flash Tool.
- Power off your One S420, connect via USB (press volume buttons if needed for detection).
- Click “Download” in SP Flash Tool and wait for completion. Reboot the device once done.
For complete step-by-step instructions with visuals and videos, follow this MTK flashing guide: MTK Flashing Tutorial.
