Here is the tricky part. Since the screen is dead, you need to use a button combination or a "deep flash" cable.
on your device, as it restores the phone to its original factory state. OnePlus Community firmware version (e.g., OxygenOS 4.0 or 9.0) for your region? Guide How to UNBRICK Oneplus 3T
: Install the Qualcomm HS-USB QDLoader 9008 drivers so the PC can communicate with the phone in EDL mode.
Here is the tricky part. Since the screen is dead, you need to use a button combination or a "deep flash" cable.
on your device, as it restores the phone to its original factory state. OnePlus Community firmware version (e.g., OxygenOS 4.0 or 9.0) for your region? Guide How to UNBRICK Oneplus 3T oneplus 3t unbrick tool
: Install the Qualcomm HS-USB QDLoader 9008 drivers so the PC can communicate with the phone in EDL mode. How to Unbrick a OnePlus 3T — Complete