Looks like another firmware update dropped for the Lab599 Discovery TX-500 transceiver.

From their change log located here:

v1.12.08 (2022.03.01)
- Beacon mode fixes
- Fixed Iambic A/B mode
- Extended CW tone frequency range
- FM mode output power increased
- User menu optimization

You can grab the firmware file from here, and the flashing tool (available for Windows and Linux) from their downloads portal.