I did two a couple of months ago. I use ESP Easy Flasher which I think was called FlashESP8266 or Tasmotizer.
Have you got the Tx and Rx the right way round?
Is it finding the com port?
I have terrible trouble with my USB to TTL module because of the driver and find I have to reinstall the older driver sometimes because Windows has updated to a later driver that doesn't work.
Lester also from Oz