The Positivo Twist 4 Pro S518B is a popular budget Android with a UNISOC SPD chipset. Common complaints include the phone stuck in bootloop after firmware errors, severe lag or freezing after updates, battery draining too quickly, Wi-Fi drops, and touchscreen glitches. Some users report FRP lock or stuck-on-logo issues after failed updates or rooting. Installing the official SPD firmware file (such as Positivo_Twist_4_Pro_S518B_210923_SPD.zip) restores factory condition, fixes bootloop and dead devices, improves overall speed, and addresses system bugs like poor battery and Wi-Fi instability. Stock ROMs deliver the smoothest, most reliable software for this model.
Positivo Twist 4 Pro S518B Firmware Details
| Device Name | Positivo Twist 4 Pro |
|---|---|
| Model | S518B |
| Chipset | UNISOC Spreadtrum SC9863A (SPD/UNISOC) |
| RAM & Storage | 2GB/3GB RAM, 32GB/64GB storage |
| Display | 6.0″ IPS LCD, HD+ |
| Camera | 8MP rear, 5MP front |
| Battery | 4000mAh |
| Operating System | Android 10 Go Edition |
| Firmware Filename | Positivo_Twist_4_Pro_S518B_210923_SPD.zip |
| Firmware Version | S518B-BT-OPEN-2021092301, Android 10 Q |
| File Size | 995MB |
| File Type | ZIP (SPD/UNISOC format) |
| Flashing Tool | SPD Research/Upgrade Tool (Spreadtrum/UNISOC Flash Tool) |
| Language Support | Multilingual |
Warning: Flashing with a wrong firmware or skipping FRP/IMEI steps can brick your Positivo Twist 4 Pro, erase IMEI, or cause software lock. Only use files for S518B, back up data, and follow the flashing guide precisely.
Download Official Firmware for Positivo Twist 4 Pro S518B
Use the official SPD firmware file below to fix bootloop, dead boot, performance lag, battery drain, and system bugs. This version includes Google apps, multi-language, and is tested for stability.
Positivo_Twist_4_Pro_S518B_210923_SPD.zip
📦 Size: 995MB
🗓️ Build Date: Sept 23, 2021
🔢 Build Version: S518B-BT-OPEN-2021092301
🤖 Android Version: 10 Go Edition
⬇️ Download Link: Google Drive
Changelog: fixes bootloop, speeds up OS, restores full battery function, Wi-Fi stability, and Google apps.
How to Flash the Firmware
- Download and install the SPD/UNISOC USB driver on your PC.
- Extract the firmware zip and open SPD Research/Upgrade Tool (Spreadtrum flash app).
- Load the .pac file from the extracted firmware folder.
- Connect your powered-off S518B while holding Vol Down or Vol Up, and click “Start.”
- Wait for process to finish and green pass message. Disconnect and reboot phone.
Need step-by-step instructions with screenshots and videos? Full SPD flashing guide here.
Guides for SPD/Unisoc devices:
Spreadtrum (UNISOC) Devices (SPD Tool): SPD Flash Tool Guide
