I need to know if your original firmware is a “D” or “W” type screen.
So I need to know exactly when you purchased it, and where you purchased it.
If you get this wrong you may end up with a pure white screen that is useless.
If this happens you have to be prepared to flash the other firmware version.
This is only possible (if you get white screen) if you have the firmware loaded in the flash tool, and click on the download button in the flash tool.
But - you must have the watch connected by the cable and long press the power button until it reboots.
As it reboots, it will flash the firmware you loaded in the flash tool automatically.
So, on the first flash you can flash the firmware on in “download only” mode and then factory reset.
(Don’t try to just flash the system partition - if you do, it won’t boot.)
If you get the white screen, or “no touch response” - you will need to let me know which version you flashed.
Then you can flash the other package I have linked in “firmware upgrade” mode in the flash tool - using the method described above.
So - which screen do you think you have?
Where and when did you buy it?