I havent saved the config at any point so if I reset i assume the username/password mistake wouldnt exist any more.
Reboot the switch is one option. You can have physical access to the appliance or you can use SNMP to remotely reboot the appliance. For this method to work, the command "snmp-server system-shutdown" needs to be enabled.
Another option is to pull down or upload the config using SNMP. This method is dependent on SNMP RW community string is disabled or not.