Using the fire toolbox, I've changed the pin to pattern and with that I can't do soft factory reset. It ask to enter pin but the pin is replaced with pattern.
In my case, I used the 5x incorrect login from lockscreen. Purposely put in 5 wrong pattern continuously, sometimes mixed in with press back on-screen button. I believed I alternate between wrong pattern and on-screen back button and it took me to Amazon and ask to login to my Amazon account with that it show a screen with reset pin option.