For continuous connection (DA mode), you must run SP Flash Tool and click "Download" before connecting the device.
You can download the Mediatek USB Port V1633 driver from the following link: [insert actual download link] Mediatek Usb Port V1633 Driver Download LINK
Open Device Manager :
What is the of the device you are trying to connect? Are you trying to flash a ROM or just transfer files ? For continuous connection (DA mode), you must run