That message looks fine, it suggests that it doesn't have a dataset loaded into it so loading in a Caltool dataset should get you up and running. The second one, it sounds like it either has an issue or could be developer locked. Did you try connecting with both serial and ethernet? Have you got a screenshot of the Caltool journal when set to Information filter level? If you can provide the full part number and serial number I can see if we have any history of this unit. Had this ECU been opened up previously and the tamper proofs broken? Unfortunately, as the ECU has been opened it will be classed as a major repair if it is sent back for us to investigate and will cost significantly more than it would if it hadn't previously been opened as we have no guaranty that further damage hasn't been caused as part of this process such as EMC static charge issues etc when it has been handled as an example. I wouldn't expect the internal backup battery to affect connection to the unit.
Cosworth Support Cosworth Electronics