Firmware Oppo A3s CPH1803 via SD Card – A Comprehensive Guide


Download Firmware Oppo A3s Google Drive - Garut Flash

Updating your Oppo A3s CPH1803 smartphone’s firmware is crucial for maintaining its optimal performance and security. Firmware updates bring bug fixes, performance enhancements, new features, and the latest security patches. While Oppo typically releases firmware updates through over-the-air (OTA) updates, there may be situations where you need to update your firmware manually using an SD card. This article will provide a step-by-step guide on how to perform a firmware update on your Oppo A3s CPH1803 via an SD card.


Before proceeding with the firmware update, ensure you have the following prerequisites:

  • An Oppo A3s CPH1803 smartphone
  • A compatible microSD card (at least 1GB of free space)
  • A computer with internet access
  • The official Oppo firmware file for your A3s CPH1803 (downloadable from Oppo’s website)
  • A USB cable to connect your smartphone to your computer

Step by Step Guide

Step 1: Download and Extract Firmware

  • On your computer, visit Oppo’s official website and download the firmware file for your A3s CPH1803.
  • Once the download is complete, extract the .zip file. The extracted folder should contain a firmware.bin file.

Step 2: Copy Firmware to SD Card

  • Insert the microSD card into your computer’s memory card reader.
  • Copy the firmware.bin file from the extracted folder onto the root directory of the SD card.

Step 3: Power Off and Insert SD Card

  • Power off your Oppo A3s CPH1803 smartphone.
  • Insert the microSD card into the card slot on your phone.

Step 4: Enter Recovery Mode

  • Press and hold the Power button and the Volume Down button simultaneously.
  • Release both buttons once you see the Oppo logo and the Android Recovery Mode menu appears.

Step 5: Initiate Firmware Update

  • Using the volume buttons to navigate and the Power button to select, choose “Apply update from SD card” from the Recovery Mode menu.
  • Navigate to and select the firmware.bin file from your SD card.
  • Confirm the update process by selecting “Yes” and waiting for the update to complete.

Step 6: Reboot Your Phone

  • Once the firmware update is complete, choose “Reboot system now” from the Recovery Mode menu.
  • Your phone will restart with the updated firmware.


  • “Update failed” error: Ensure the downloaded firmware file is compatible with your Oppo A3s CPH1803 model and the microSD card is properly inserted.
  • “System Not Upgrading” message: Wait patiently as the update may take some time. Do not interrupt the update process.
  • **Brick

Firmware Oppo A3s Cph1803 via Sd Card – UnBrick.ID

Firmware Oppo A3s Cph1803 Via Sd Card

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