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TESTED FIRMWARE
HANG ON LOGO DONE
EMMC REPAIR
BASEBAND FIX 
RESTART FIX
Oppo_A3s_CPH1803_EX_11_A.03
Oppo_A3S_CPH1803_EX_11_A.12
Oppo_A3S_CPH1803_EX_11_A.29
Oppo_A3S_CPH1803_EX_11_A.34
Flashing Oppo A3s CPH1803 using UFI box can be done by following these steps:

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.