MSM DOWNLOAD TOOL OPPO: https://drive.google.com/file/d/1YvBcGixLC7PdQtoc4IH0pjaQbt7fpYx3/view
Qualcomm HS-USB QDLoader 9008 Driver: https://www.mediafire.com/file/3cb5gexb00to6lu/Qualcomm+HS-USB+Driver+32bit+64bit+Setup.rar/file
Firmware OPPO A3S: https://support.oppo.com/id/software-update/software-download/?m=A3s%28CPH1803%29