10Gtek ASF-10G-T copper module: ethtool -m returns Operation not supported until the NIC firmware is updated

A customer with a 10Gtek ASF-10G-T 10GBASE-T transceiver could not read its EEPROM: ethtool -m ens802f0 returned Cannot get module EEPROM information: Operation not supported. The vendor attributed it to a firmware version mismatch between the NIC and the transceiver. Hardware involved: 10G NIC (unspecified), 10Gtek ASF-10G-T 10GBASE-T.

• Hardware: 10G NIC (unspecified)
• Transceivers: 10Gtek ASF-10G-T 10GBASE-T
• Form factor: SFP+

Symptoms / messages:

Cannot get module EEPROM information: Operation not supported