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How to install and use Telnet on Mac OSX Mojave Catalina High Sierra EI Capitan A utility website for MAC users to search for any MAC app and get the steps t. I asked why you had a problem with third-party software. I didn't suggest applications that are not suited for telnet, directly. Just install telnet via homebrew. Telnet is completely insecure, so make sure you are on an isolated network connection to the host. Or, find a install Linux on it to telnet into the host. Then restart your Mac and hold the Option key until you see the Apple logo. In the Startup Disk, click the external drive name. When the boot resumes, you should boot into macOS Catalina installation wizard. At this stage, you should pick up the external SSD to install Catalina. Another way to boot Catalina is from System Preferences.
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