The failsafe account will still work in EXOS 15.7 and earlier. In order to allow login after downgrading, first configure the failsafe account, and ensure that it is enabled. Note that EXOS will not display the password while it is being entered.
X460-48t.1 # configure failsafe-account
enter failsafe user name: failsafe
enter failsafe password:
enter password again:
X460-48t.2 # configure failsafe-account permit ?
all Apply change to all failsafe account access methods
control Connections over the control fabric between nodes
serial Connections over the Serial Console ports
ssh Connections via the SSH protocol
telnet Connections via the TELNET protocol
X460-48t.2 # configure failsafe-account permit serial
Once the failsafe account has been configured, you can downgrade to an older EXOS release, then delete and re-create the accounts to save the passwords using MD5. A temporary account must be created, as EXOS will not allow all admin acccounts to be deleted.
X460-48t.2 # create account admin temp admin123
X460-48t.3 # delete account admin
X460-48t.4 # create account admin admin admin123
X460-48t.5 # delete account temp
In the example above, the account "admin" was deleted, and re-created with a password of "admin123".