Ensure you aren't trying to use an MT6765 scatter on an MT6769Z device.

What are you seeing in your flashing tool? Are you trying to unbrick the device, or bypass a lock ?

This occurs when the computer fails to maintain communication with the chipset. Try a different USB port (USB 2.0 is more stable than USB 3.0), replace your cable, or re-install the MediaTek MTK USB Preloader drivers.

To apply the scatter file to a broken or bootlooping phone, you will need a computer, a high-quality USB cable, and dedicated flashing software. Prerequisites: A Windows PC. installed on the computer.