Oppo A3s Software Update: December 2020 – CPH1803EX_11_A.33

The Oppo A3s is also known as Oppo CPH1803 was released back in 2018. It came with Android 8.1 Oreo over ColorOS 5.1 skin out-of-the-box. Now, there is good news for all the Oppo A3s users as the May 2020 Android Security Patch update is rolling out via batches that bump up a new software version CPH1803EX_11_A.28 based on Android 9.0 Pie. However, if you haven’t received the OTA update yet or missed out on any particular update and want to install it, then you can check this article. Here we’ve also shared the Oppo A3s Software Update Tracker list.

It’s worth mentioning that the new firmware update CPH1803EX_11_A.28 is rolling out via OTA and will take some time to appear on the units. It basically brings the May 2020 Android Security Patch level for the device that fixes the security vulnerability that could enable a remote attacker. We will always recommend our readers update their devices in its latest version at least for the security patch version as early as possible.

Oppo A3s Software Update: May 2020 Security Patch - CPH1803EX_11_A.28

Oppo A3s Specifications

It has a 6.2-inches IPS LCD display, 720×1520 pixels resolution, a 19:9 aspect ratio screen, Corning Gorilla 3 protection, Snapdragon 450 SoC, Adreno 506 GPU, etc. It pairs 2GB/3GB/4GB RAM, 16GB/32GB/64GB of internal storage that has an expandable microSD card option.

The handset packs a dual rear camera setup of a 13MP+2MP lens with an LED flash, HDR, Panorama, etc. While an 8MP selfie camera is also available. In terms of the connectivity options, the device sports Wi-Fi 802.11 b/g/n, a 3.5mm audio jack, Bluetooth 4.2, GPS, A-GPS, FM Radio, micro USB 2.0, USB OTG, etc.

The handset packs an accelerometer sensor, gyroscope, proximity sensor, compass sensor, etc. It has a 4,230mAh battery with 20W VOOC fast charging support.

Oppo A3s Software Update Tracker

Whenever a new official firmware update will be available for the Oppo A3s model, we will keep updating the update tracker list here with the changelog and download links below.

Software Version Changelog

Download Link


  • Added the December 2020 Android security patches to enhance system security.
CPH1803EX_11_A.28 「Security」
·Added the May 2020 Android security patch to enhance system security
CPH1803EX_11_A.27 Link
CPH1803EX_11_A.25 Link
CPH1803EX_11_A.24 Link
CPH1803EX_11_A.20 Link
CPH1803EX_11_A.18 Link
CPH1803EX_11_A.17 Link
CPH1803EX_11_A.13 Link
CPH1803EX_11_A.13 Link
CPH1803EX_11_A.12 Link

How to Check Software Update on Oppo A3s

Before going to the manual firmware upgrade process, if you feel that your device isn’t receiving the OTA update notification for a while, then you can check for the software update manually. In order to do this:

Go to the device Settings > System updates. It will search for the software update and you will get notified if a new update is available on your device. Simply grab the firmware version by downloading and installing it.

Additionally, it’s recommended to maintain the phone charge at least up to 50%-60% and connect your device to a Wi-Fi for a faster and stable download.

Update Guide: How to Flash Oppo Firmware on your device [Software update guide]

Now, let’s assume that you’ve successfully upgraded your Oppo A3s device to the latest software version. Facing any issue with the software update guide? Comment below.

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