Can't access to http://ratos.local/configure

Greetings everyone!
I have experienced an issue with an extremely bad wifi connection of my Raspberry Pi 3 B+. Previously everything was fine and the location of the printer remains the same as before. So I was trying to change the wifi network, which resulted in a disconnection from my network. Now I can only connect via RatOS wifi. When trying to run a configurator to update the wifi setting I receive a "502 Bad Gateway" error.
Was trying to follow some guidance in this channel but unsuccessfully. For example, trying to run "pi@ratos:~/ratos-configurator$ pnpm start" resulted in an error. Since I consider re-flashing my Pi as the last resort, I would like to know your thoughts.
Thank you in advance!
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