Tecno Spark 40 4G KM5 / X6728B Tested Downgrade Firmware

📱 Device: Tecno Spark 40 4G
🔹 Model: KM5 / X6728B
🔹 Android Version: 15
🔹 Firmware Version: 15.1.1.108SP03
🔹 Security: July 2025
🔹 Build: OP001PF001AZ
🔹 Included File: LK.bin
🔹 Purpose: Downgrade and bootloader unlock support
🔹 Status: Tested by GSM BISMA
🔹 Credit: GSM BISMA

📥 Download Links:

🔗 Downgrade Firmware:


⚠️ Important:
Verify the exact model, firmware version, and security patch before flashing. Downgrading firmware or modifying LK.bin can cause data loss or device failure. Back up important data and use compatible files only.

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