Then execute the snmpUSMKeyChange.java file by giving the correct credentials.

General Usage: snmpUSMKeyChange [-d] [-p port] [-r retries] [-t timeout]
[-a auth_protocol] [-w auth_password] [-s priv_password] [-pp priv_protocol(DES/AES-128/AES-192/AES-256/3DES)] [-n contextName] [-i contextID] [-y new_auth_password] [-z new_priv_password] [ -ou user_name] [ -ow old_auth_password] [ -oz old_priv_password] userName  host
   
Example : java snmpUSMKeyChange -d -p 8001 -a MD5 -w authUser -n auth -y authUserNew authUser localhost

The above inputs will modify the authentication password of the user "authUser" from "authUser" to "authUserNew". The user's authentication protocol is "MD5".

If you want to change the password of an usm user entry in the database, snmpUSMKeyChange.java is not meant for that. You have to delete the older entry and add with new credentials manually. 

Trust the information provided is helpful. Please get back to us for further support.

Thanks & Regards,
BharathaSelvan.