The is a popular Qualcomm-powered smartphone that occasionally requires firmware flashing to resolve issues like boot loops, "Hang on Logo," or forgotten screen locks. Using the Qualcomm Flash Image Loader (QFIL) is a reliable method for unbricking the device when official OTA updates are not possible . Oppo A3s CPH1803 Firmware Details
To ensure a successful flash, you must use the correct firmware version for the variant, which features the Snapdragon 450 chipset. oppo a3s qfil firmware cph1803 qfil flash file link