modulation 6 is not supported

We use the TBS 6984.
When the produce scan-s2 in DVB-S2 (8QPSK), the card does not lock and get the following dmesg:
[ 237.936495] TurboSight TBS 6984 Frontend:
[ 237.936496] tbs6984fe - modulation 6 is not supported
driver last
Thanks
When the produce scan-s2 in DVB-S2 (8QPSK), the card does not lock and get the following dmesg:
[ 237.936495] TurboSight TBS 6984 Frontend:
[ 237.936496] tbs6984fe - modulation 6 is not supported
driver last
Thanks