reset-fail

Hi, I have set up my ASUS TUF-AX6000 to connect to it via HTTPS, which has worked perfectly. Yesterday I connected a crappy HP printer to my laptop via WI-fi, and afterwards, I couldn't connect to my router. When I go to xxxxasuscomm.com:8443 I get connection failed. So I wanted to reset it...

I have an AC88U from 2016. Still a great router. It is currently configured with the latest firmware which is Firmware Version:3.0.0.4.386_48260. I try to change my admin password once or twice a year. But about 12-18 months ago, I hit a snag and it now thinks the existing password I input on...