I have the same module you referenced in the first post in this thread.
I searched for "Makerfocus ESP8266 Module ESP-12E NodeMcu" and found the same module picture on Amazon. So I think they are the same module.
So I first did a "Firmware Flash" from the OS utility, choosing 4M for Flash Size. No problem.
Then I decided to try a "Format Flash" and it "seemed" to fail. After waiting for a bit for response from module to reboot I got just a few garbage characters. Then I went back and re-tried to "Format Flash" again and the tool crashed right away. So then I closed the tool, powered down the module, held in the reset and flash button and powered up (plugged in the usb) and tried the tool again but did the "Firmware Flash" and it did work and the module came up as expected.
I rarely have had to use the "Format Flash" option from the tool. I have always just used the "Firmware Flash" and all is good.
This seems similar to what you reported earlier when you said all you got was a few garbage characters and nothing on the wifi side.
Give it a go again and choose "firmware flash"
I usually don't start the flasher tool until after I have powered up the module. That way the tool can find the Comm port assigned to the module.
Mike... is there a problem with the "Format Flash"???
hope this helps