Oppo F9/F9 Pro CPH1823 Download Not Completed Error Fix | Oppo_Custom.bin Solution

Fix “Download Not Completed” Error on Oppo F9/F9 Pro (CPH1823)

If you’re flashing an Oppo F9 or F9 Pro (model CPH1823) and face the “Download not completed” error in SP Flash Tool or MSM Download Tool, you’re not alone. This issue usually appears when the firmware package contains a missing or mismatched Oppo_Custom.bin file. Let’s fix it step by step.

Why This Error Happens

• Corrupted or missing Oppo_Custom.bin file in the firmware package
• Incompatible firmware version for your specific region (e.g., India vs Global ROM)
• Using wrong scatter file or unverified firmware
• Incomplete flashing or bad USB connection during download

Tools & Files You’ll Need

• SP Flash Tool / MSM Download Tool (latest version)
• Official Oppo F9/F9 Pro CPH1823 Stock ROM (download from MobiFirms.com)
• Oppo_Custom.bin Fix File (available under Fixed Firmware section on MobiFirms)
• MTK USB Drivers (for proper PC-to-device connection)
• Good quality USB data cable

Step-by-Step Fix Guide

Step 1: Download Correct Firmware

Visit MobiFirms.com and search for “Oppo F9 CPH1823 official firmware.”
Download the tested stock ROM and ensure it matches your exact model number.

Step 2: Replace the Oppo_Custom.bin File

After extracting the firmware, go to the firmware folder and locate the file named:

Oppo_Custom.bin

Replace it with the fixed Oppo_Custom.bin downloaded from MobiFirms Fixed Firmware section.

Step 3: Flash the Device

• Open SP Flash Tool (or MSM Tool)
• Load the scatter file from the firmware folder
• Click on Download
• Connect your powered-off device while holding Volume Up or Down
• Wait until flashing completes successfully

After Flash Check

Once flashing is complete, reboot your phone. The device should boot up normally without the “Download not completed” message. If you still face issues, try using another USB port, reinstall MTK drivers, or re-flash using the fixed firmware version.

Pro Tips for Technicians

• Always keep a backup of NVRAM before flashing MTK devices.
• Use the original Oppo flash tool for higher success rate.
• Avoid mixing firmware from different regional builds.
• Store fixed custom files (like Oppo_Custom.bin) in a dedicated repair folder for quick reuse.

Download Section

👉 Download Oppo F9/F9 Pro CPH1823 Fixed Firmware (Oppo_Custom.bin)
👉 Get Latest SP Flash Tool for MTK Devices

Final Words

Fixing the Oppo F9/F9 Pro CPH1823 Download not completed error is simple once you use the correct Oppo_Custom.bin file. With MobiFirms, you get official firmware, fixed files, and tested flash tools that help you repair and restore your device safely.

💡 Visit MobiFirms.com to download the tested firmware and fix files for all Oppo and MTK devices.