If you want to flash the Oppo F9 Pro (model CPH1823) and fix the "Unknown Baseband" issue using a UFI Box, you must first ensure the battery is charged to at least 95%. You can use any compatible charger for this.

Your data is very important, so it's highly recommended to back it up before proceeding. This backup may include contact details, important messages, emails, or any other crucial information stored on your device.

You can perform the backup on another device. It is essential to back up your data because once the phone is formatted, all data will be erased and cannot be recovered. For backup, you can use an external device such as a hard drive, SD card, or any other suitable storage option.

Note: If you are performing this process yourself, do it at your own risk. We are not responsible for any damage that may occur to the device.

This method of flashing and fixing the baseband issue using the UFI Box can be used by both beginners and experienced Android software technicians. If you encounter an error such as "USB not recognized," it may indicate that your USB cable is faulty. Also, if the battery is not sufficiently charged, the USB connection may not work properly, which could cause the process to fail.

If you have any questions or face any issues, feel free to write them in the comment section. I will try my best to assist you.

We regularly share posts related to Android phone software issues. Many of these problems can be solved for free using the methods we provide. Some cases may require professional tools like a flashing box, while others can be fixed without one — including issues like software errors, pattern lock, and FRP lock (Google account bypass).

Oppo F9 Pro CPH1823 Fix Unknown Baseband Firmware

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Credit : FirmwareX.Net