Fix Oppo A91 CPH2021 Download Not Completed Error | Oppo_Custom.bin Solution

Oppo A91 CPH2021 Download Not Completed Error – Complete Fix Guide

If you’re flashing your Oppo A91 (CPH2021) and encounter the “Download not completed” error in SP Flash Tool or MSM Download Tool, don’t worry — this guide will help you fix it step by step. This issue usually happens when the Oppo_Custom.bin file is missing, corrupted, or mismatched with the firmware version.

Common Causes of “Download Not Completed” Error

Before fixing, let’s understand why this error occurs:

This problem is common on MTK-powered Oppo devices like A91, A12, and A31 — and can be fixed easily with the right firmware package.

Step-by-Step Fix for Oppo A91 CPH2021 Download Error

Step 1: Get the Correct Firmware

Download the official Oppo A91 CPH2021 firmware that matches your device region and build number from a trusted source like MobiFirms.com.
Make sure it includes the Oppo_Custom.bin file in the firmware folder.

Step 2: Extract and Verify Files

• Extract the firmware ZIP on your PC.
• Check inside the firmware folder for Oppo_Custom.bin.
• If it’s missing or empty, download the fixed Oppo_Custom.bin file provided separately on MobiFirms.

Step 3: Use Correct Flash Tool

For MTK-based Oppo A91:

• Use SP Flash Tool v5.2112 or newer.
• Load the scatter.txt file from the extracted firmware folder.
• Ensure all partitions are correctly mapped.

Step 4: Flash the Firmware

• Power off your phone completely.
• Hold Volume Up + Volume Down, then connect USB cable.
• Click Download on SP Flash Tool and wait for the process to complete.

Step 5: Reboot and Test

Once flashing completes successfully, the device will reboot automatically. The “Download not completed” error will be gone, and your Oppo A91 will boot normally.

Pro Tip – Using Fixed Oppo_Custom.bin

If the issue persists even with official firmware, replace only the Oppo_Custom.bin file from the fixed firmware package before flashing again. This file is responsible for region-specific system configuration — a mismatched one triggers the download error.

You can download the tested fixed Oppo_Custom.bin file for CPH2021 directly from MobiFirms to ensure 100% success.

Conclusion

The Oppo A91 CPH2021 download not completed error mainly occurs due to a faulty or mismatched Oppo_Custom.bin file. With the correct firmware and flashing procedure, you can easily restore your phone without damage.

💡 Download tested Oppo A91 firmware and fixed Oppo_Custom.bin files from MobiFirms.com to ensure safe and verified flashing.