Send the following on WhatsApp
Continue to ChatDownload and Install Stock ROM for OnePlus 3 (Oxygen OS 3.1.2) https://www.stechguide.com/download-stock-rom-for-oneplus-3/
Download and Install Stock ROM for OnePlus 3 (Oxygen OS 3.1.2) https://www.stechguide.com/download-stock-rom-for-oneplus-3/