The Positivo Twist 4 Fit S509N is a budget Android with UNISOC/Spreadtrum chipset, ideal for calls, light apps, and simple photos. Users have reported frequent complaints: slow system response, repeated app “freezing,” rapid battery drain, random reboots, stuck on logo/bootloop after failed updates, poor camera quality, and storage errors. The 1GB RAM is a key limit, causing lags even in light tasks, and sometimes camera/IMEI or Wi-Fi failures appear after unofficial flashes or factory resets. These official firmware files restore your phone to default state—unbricking dead units, fixing bootloops, recovering lost IMEI/SIM, and improving general speed and camera bugs.
Positivo Twist 4 Fit S509N Firmware Details
| Device Name | Positivo Twist 4 Fit |
|---|---|
| Model | S509N |
| Chipset | UNISOC SC7731E (SPD/Spreadtrum) |
| CPU | Quad-core 1.3GHz Cortex-A7 |
| GPU | Mali-T820 MP1 |
| RAM & Storage | 1GB RAM, 32GB storage (MicroSD up to 64GB) |
| Display | 5.0″ IPS LCD, 720×1440 px |
| Camera | Rear: 8MP, Front: 5MP |
| Battery | 2500 mAh Li-Ion |
| Operating System | Android 10 (Go Edition) |
| Firmware Filenames | Positivo_Twist_4_Fit_S509N_210614_10_SPD.zip Positivo_Twist_4_Fit_S509N_130221_SPD.zip |
| Firmware Version | Android 10 Go Patch 210614/130221 |
| File Sizes | 977MB each |
| File Types | ZIP (SPD PAC format) |
| Flashing Tool | SPD Research/Upgrade Tool (Spreadtrum/UNISOC Flash Tool) |
Warning: Flashing with the wrong ROM, skipping backup, or using unofficial drivers can brick your phone or erase IMEI. Only use S509N-specific files, and always back up your data before flashing. 1GB RAM limits device performance—expect some lag after reset.
Download Official Firmware for Positivo Twist 4 Fit S509N
Positivo_Twist_4_Fit_S509N_210614_10_SPD.zip
📦 Size: 977MB
🗓️ Build Date: Jun 14, 2021
🔢 Firmware Version: SPD/UNISOC Android 10 Patch
⬇️ Download Link: Google Drive
Used for unbricking, bootloop repair, and system reset.
Positivo_Twist_4_Fit_S509N_130221_SPD.zip
📦 Size: 977MB
🗓️ Build Date: Feb 13, 2021
🔢 Firmware Version: SPD/UNISOC Android 10 Patch
⬇️ Download Link: Google Drive
Older patch, also for recovery and bug fixes.
How to Flash the Firmware
- Download and extract the ZIP, install SPD/UNISOC USB and ADB drivers for your PC.
- Open SPD Research/Upgrade Tool and load the included.pac file.
- Connect the phone (off, Vol Down or Up held) to PC, click “Start.”
- Wait for flashing to finish (do not disconnect early).
- First boot may take several minutes—set up device from factory reset when done.
Want a full manual with screenshots or troubleshooting for S509N? See complete flashing guide.
Guides for SPD/Unisoc models:
UNISOC/Spreadtrum Devices (SPD Tool): How to use SPD Flash Tool
Disclaimer: Incorrect flashing or wrong drivers can permanently brick your Positivo Twist 4 Fit S509N. If unsure, comment below for help—always backup and confirm your model!
