If you forgot your password for an Aruba 620, you can perform a password reset using the RS232 (serial) console port and some magic words.

Connect to the Aruba 620 using an RS232 DB9-to-RJ45 cable. This cable is pretty standard, and is also used for a lot of Cisco equipment.

The default serial settings are as follows:

9600 baud
8 data bits
no parity bit
1 stop bit
no flow control

At the user: prompt, enter password. As a password, enter forgetme!.

Type enable to enter a more privileged mode that will allow you to make changes.

Enter the system configuration menu with configure terminal. Finally, you can use mgmt-user admin PASSWORD to set the password - but you still have to write changes to disk.

Use write memory to make the changes permenant, and that’s it!