The Zopo Speed 7C ZP550 S5586 M was released seven months later, featuring a minor hardware revision and Android Marshmallow adaptation for improved battery management and VoLTE compatibility. Real-world usage revealed new issues: higher standby drain, fingerprint sensor recognition errors, and VoLTE dropouts reported in 2016-2017 brand community archives. The September 14, 2016 build was the last stable update distributed by Zopo before ceasing Android 6.0 support for Speed 7C devices, particularly for models sold in emerging Asian markets.
| Device Name | Zopo Speed 7C ZP550 S5586 M |
|---|---|
| Chipset | MediaTek MT6735 (Quad-core 1.3GHz) |
| Key Feature | Android 6.0 Upgrade, VoLTE, Fingerprint Sensor |
| Android Version | 6.0 Marshmallow |
| RAM / Storage | 2GB RAM / 16GB ROM |
| Firmware Version | Final Stable (Production) |
| Build Date | September 14, 2016 |
| File Size | ~1GB |
| File Type | Scatter-based (.txt) |
| Flashing Tool | SP Flash Tool (MediaTek) |
Size: ~1GB
Build Date: September 14, 2016
Download Link: MediaFire Direct Link
Why Flash This Specific Firmware?
- Fix fingerprint sensor misreads: S5586 M forum reports, post-Android 6.0 upgrade, document “fingerprint not recognized” on stock ROM after failed update; this file restores full biometric driver stack.
- Correct battery drain bug found only on S5586 M Marshmallow revision: Final update optimizes wake lock management, reducing standby power consumption by 25% (confirmed in real-world battery tests).
- Recover VoLTE and network registration on Indian/South Asian bands: Restores modem configuration for VoLTE and ensures network registration without dropouts or misdetection, critical for Jio/Airtel users post-2016.
- Fix boot failures and UI errors after failed OTA updates: September build rebuilds boot and recovery partition, enabling safe startup and factory reset access.
- Retain IMEI and device calibration: “Download Only” mode preserves registration; firmware updates the proper configuration for S5586 M hardware only.
How to Flash the Firmware
Flashing the scatter-based firmware onto your Zopo Speed 7C ZP550 device requires the SP Flash Tool. Follow these steps:
- Setup the Tool: Download and extract the firmware. Launch SP Flash Tool, click Scatter-loading, and select the correct scatter file for your hardware variant.
- Select Download Mode: Choose “Download Only” (not “Firmware Upgrade”) to preserve IMEI and modem calibration; select all partitions.
- Start Download: Click the Download button (green arrow).
- Connect Phone: Power off, connect to PC with USB. Wait 10–14 minutes; a green checkmark signals finish. Power on to verify.
Full tutorial with screenshots and troubleshooting: How to Flash Stock Firmware to MediaTek (MTK) Smartphones
