Mobicel Star Firmware Flash File Download [Stock Rom]

The Mobicel Star (SP7731E) is a budget Android phone built on a Spreadtrum/Unisoc SC7731E platform, shipped with 1GB RAM, 8GB storage, Android 8.1 Go, and a 2500mAh removable battery. This ultra-basic hardware frequently suffers from severe lag, persistent freezing, random reboots, Wi-Fi/Bluetooth drops, app crashes, and common bootloop symptoms where the device fails to pass the Mobicel/Android logo. A clean flash of the official factory PAC firmware is often the only stable fix for these deeply-embedded software issues.

Use only the full SPD PAC file and SPD Upgrade Tool (Research Download) for flashing and recovery on this model.

Mobicel Star SP7731E Firmware Details

Check the hardware table for compatibility before flashing:

Download Official Firmware for Mobicel Star SP7731E

• Build: MDD_2ND_Variant_CM2_310121_8.1.0_MIRA
  • File Name: Mobicel_Star_SP7731E_MDD_2ND_Variant_CM2_310121_8.1.0_MIRA.zip
  • Size: 752MB
  • 🔗 Download Link: Download (MediaFire)

Why Flash This Specific Firmware?

• Bootloop and Startup Recovery: Restores devices stuck at the Mobicel logo, constant restarts, or unresponsive black screens—full PAC flash repairs the core partitions.
• Repair Persistent Freezing, App Crash, and Lag: Wipes out all software clutter, rogue apps/configs, malware, and restores clean official system files.
• Fix Camera, Battery, and Wireless Bugs: Camera app not opening/crashing, Wi-Fi/Bluetooth not responding, battery “unplug/reboot” cycles, are often solved by firmware reset.
• Unbrick or Recover After Failed Mods: Most bricked Mobicel Star SC7731E can be revived with proper PAC flash unless mainboard/nand is physically damaged.

Crucial Prerequisites Before Flashing

Back up all content—flashing deletes apps, settings, user files, and accounts.

• Latest SPD Upgrade Tool or Research Download tool for PAC firmware.
• Install all Spreadtrum/Unisoc USB drivers (Windows).

How to Flash the Firmware

1. Download and extract the full Mobicel_Star_SP7731E_MDD_2ND_Variant_CM2_310121_8.1.0_MIRA.zip file.
2. Install required Spreadtrum/Unisoc USB drivers.
3. Open SPD Upgrade Tool (UpgradeDownload.exe).
4. Click the gear icon; select the .pac file from extracted folder.
5. Turn off phone (remove battery if possible).
6. Hold Volume Down while plugging via USB.
7. Click “Start Downloading” and wait for green “Passed”.

Step-by-step visuals: How to Use the SPD Upgrade Tool

Disclaimer: Firmware flashing deletes all user data and risks bricking device if interrupted. Do not flash the wrong file—proceed at your own risk.