After updating the operating system to Debian and plugging in your BeagleBone Black via USB you may receive the error message:
WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!
This is normal as the RSA key has changed when you updated the OS.
The easiest way to fix it is to run
ssh-keygen -R then try connecting again.
When connected via USB
ssh-keygen -R 192.168.7.2
When connected via Ethernet
ssh-keygen -R beaglebone.local
You should then be asked to add the new fingerprint to your "known hosts", say
yes and you should then be asked for your Debian password who’s default is
And your in