Same problem with 9.0.3
After flashing the OPO3 modem firmware 9.0.3 I also could not decrypt the storage anymore and even after after full factory reset of LOS16 with modem9.0.3 in addition the fingerprint reader was not working anymore.
After I reflashed modem 5.0.8 the fingerprint reader worked again.
After flashing the OPO3 modem firmware 9.0.3 I also could not decrypt the storage anymore and even after after full factory reset of LOS16 with modem9.0.3 in addition the fingerprint reader was not working anymore.
After I reflashed modem 5.0.8 the fingerprint reader worked again.