Once you have your tape hardware working, there shouldn't be a need to update the firmware or tape drivers. However you will often see this listed as a step to try in troubleshooting procedures.
A list of places to get further information and support for Backup Exec:
There are several remote agents available for Backup Exec. The most commonly used is the Agent for Windows servers. This is used for every backup of a Windows server, even the Backup Exec media server itself.