If "zmm220" refers to a specific device or system:
Help resetting a forgotten admin password on the physical device menu. zmm220 default telnet password
However, successfully logging in should be the beginning of your work, not the end. Use that shell to audit the device, patch the vulnerabilities, and disable the ancient Telnet service. In 2025, leaving port 23 open with default credentials is functionally equivalent to leaving the key in your front door lock, with a neon sign pointing to it. If "zmm220" refers to a specific device or
Research and empirical testing confirm that the ZMM220 platform ships with a default Telnet daemon enabled. The standard credentials are often one of the following combinations: Once you have successfully logged in via telnet,
opkg update
opkg install dropbear
/etc/init.d/dropbear enable
/etc/init.d/dropbear start
Once you have successfully logged in via telnet, you can perform several advanced administrative tasks:
