The process for flashing an Oppo A3s is quite similar to the Oppo A37:
1. **Get the Firmware:
Obtain the specific firmware for your Oppo A3s from the official Oppo website or authorized service centers.
2. **Gather Necessary Tools:**
Prepare a computer, a compatible USB cable, and the appropriate flashing software for Oppo devices.
3. **Backup Data:**
Prior to flashing, back up all important data on your device as the flashing process could erase everything.
4. **Enable Developer Options and USB Debugging:**
On your device, enable Developer Options and USB debugging in the Settings menu.
5. **Install Required Software on PC:**
Install the relevant flashing software or tool on your computer.
6. **Boot into Download/Recovery Mode:**
Turn off the device and boot into download or recovery mode using specific key combinations.
7. **Flash the Firmware:**
Use the flashing tool on your PC to select and flash the downloaded firmware to your Oppo A3s.
8. **Wait for Completion:**
Follow the instructions provided by the flashing tool and allow the process to complete.
Just like with the Oppo A37, flashing a device carries risks and might void the warranty. Ensure you have the correct firmware and a good understanding of the process before proceeding. If uncertain, seek help from a professional or an authorized service center.