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TESTED FIRMWARE
HANG ON LOGO DONE
EMMC REPAIR
Oppo_A3_CPH1837_EX_11_A.39 
Oppo_A3_CPH1837_EX_11_A.37 
Oppo_A3_CPH1837_EX_11_A.31
To flash an Oppo A3 CPH1837 using a UFI box, you can follow these steps:

Download the appropriate firmware package for your Oppo A3 CPH1837 from a reliable source.
Install the Oppo USB drivers on your computer.
Open the UFI box software on your computer.
Connect your Oppo A3 CPH1837 to your computer using a USB cable.
Select "Brand" as "Oppo" and "Model" as "CPH1837" from the drop-down menu in the UFI box software.
Click on the "EMMC" tab and select "Format FS" from the drop-down menu.
Click on the "Load XML" button and select the scatter file from the extracted firmware package.
Click on the "Start" button to begin the flashing process.
Once the flashing process is complete, disconnect your Oppo A3 CPH1837 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. Additionally, make sure to use the correct firmware package and follow the steps carefully to avoid any issues.