Backup fails after replacing LTO 3 with LTO 6

Hi,

we are using Backup Exec 2010 R3 SP2 with a HP Library.

We are facing some problems with the backup since we had replaced out LTO 3 drive with an LTO 6 drive.

The job starts without problems, but when the first tape is full, the job stops ant we get the message, that the media is write protected.

E00084F8 - V-79-57344-34031

The hardware and Backup Exec are up to date and we installaed Hotfix 202063 (LTO 6 support).

Any ideas?