According to the information we have received, the previous AA cells (IHO test dataset) are no longer relevant and have been replaced by the "Chart 1" dataset.
This dataset should normally come preinstalled with the ECDIS, but if it is missing we have made it available for download from the link below in S-57 format.
https://navstorage.navtor.com/download/Chart1.zip
However, please note that we do not have specific details on how to load and use the dataset on each specific ECDIS brand, so please consult ECDIS Manufacturer support prior to loading the data if needed.