How to Install Stock Firmware on Oppo A3S

Download Stock Firmware /Flash File For CPH1803 Oppo A3S:

official Stock Firmware Flash File Now available for the Oppo A3S & You can download it From below. The ROM is Flashable only With the MSM Download tool & it Require a authorized Oppo id.

Oppo A3S Run on Android 8.1 & it is Powered by QCOM 450 Processor. it is a Dual SIM (GSM and GSM) Smartphone Support Nano-SIM Cards. Connectivity options Include Wi-Fi hotspot GPS Bluetooth OTG FM 3G and 4G.

The device come with 2GB of RAM and 16GB of Storage Can be Expandable via SD Card. in Camera Department it Come with 13+2MP Rear Camera With a 8MP Front Shooter.


  • all data will be erased so must make a backup before process
  • charge the device at-least 50% to prevent accidental shut down
Must Require:

Firmware Information:

Device Name: Oppo A3S
Type: Full ROM
ROM Size: up to 4.1GB
SoC: QCOM SD 450
Os: Android 8.1
Password: Null
Gapps: Included
Root access: Not
Firmware version: CPH1803EX_11_A.12_180927

Download Links:

Firmware files:

  • CPH1803EX_11_A.12_180927 : Download
  • Oppo_A3s_CPH1853_11_A.16_181022 : Download
  • authorized Oppo ID Require..

Flash Tools:

usb Driver: 

How to Install Official Firmware on Oppo A3S:

  • Extract ROM File & MSM Download tool in Same Folder
  • Now Install OPPO Driver on Computer
  • Connect Phone to PC using USB (In EDL Mod Volume up down + USB)
  • Run MSM Download tool. it will automatically Load the Firmware if Not then Select Firmware and then and Click Start. wait until Flashing Complete done. unplug Phone and bootup.

Have any question Let me know via Comment.



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