You must install MediaTek (MTK) USB VCOM drivers on your PC for the tool to recognize the phone in "Download Mode". 4. Modern Limitations and Alternatives
Scanning... Downloading... Verification passed. firmware oppo f1s a1601
Try SP Flash Tool with a battery pull/reinsert. If detected as “MT65xx Preloader” for a few seconds, it’s recoverable. You must install MediaTek (MTK) USB VCOM drivers