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TESTED FIRMWARE 
HANG ON LOGO DONE
EMMC REPAIR
Oppo_A3S_CPH1829_EX_11_A.39
Flashing an Oppo A3S CPH1829 using a UFI box can be done by following these steps:

Connect your Oppo A3S CPH1829 to your computer using a USB cable.
Open the UFI box software on your computer.
Select "Brand" as "Oppo" and "Model" as "CPH1829" from the drop-down menu in the UFI box software.
Click on the "EMMC" tab and select "Full Erase" from the drop-down menu.
Click on the "Advanced" button and select "Boot 1" and "Boot 2" options.
Click on the "Start" button to begin the flashing process.
Once the process is complete, disconnect your Oppo A3S CPH1829 from your computer and restart it.
It's important to note that flashing your device can lead to data loss and other issues, so proceed with caution and make sure to backup your data before starting the process.
Download the firmware of Oppo A3s CPH1803 from a trusted source.

Extract the firmware file and copy it to the UFI-Box folder on your computer.

Open the UFI-Box software and select "Oppo" from the list of supported brands.

Connect your Oppo A3s CPH1803 to the UFI box using a USB cable.

Click on the "Identify" button in the UFI-Box software to detect the device.

Once the device is identified, select "Format FS" from the UFI-Box software.

After formatting, select "Flash" from the UFI-Box software.

Browse and select the firmware file for Oppo A3s CPH1803.

Click on the "Flash" button to start the flashing process.

Wait for the process to complete, which may take several minutes.

Once the flashing process is complete, disconnect the device from the UFI box and restart it.

It is important to note that flashing your device can be risky and can potentially damage your device if not done properly. Therefore, it is recommended to seek the assistance of a professional technician if you are not familiar with the process.