Cannot upgrade simple shell to fully interactive session

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I am learning CTF and have problems with upgrading shell.

This is instruction I use - https://blog.ropnop.com/upgrading-simple-shells-to-fully-interactive-ttys/#method-3-upgrading-from-netcat-with-magic

Method 1 does not help - Ctrl+C stopes netcat.

Method 2 does not work - after set up a listener, terminal stop respond to any keys.

Method 3 almost work - but after pressing Enter I get ^M on terminal and commands do not run.

What I am doing wrong? How can I upgrade the shell?

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