I've realised that the GPO doesn't drive the PIN low, after I published a Message. I've read in your Datasheet that it Needs a  "UpdateBinary command execution" (GPO is driven low after a delay (1) following the beginning of the correspondent UpdateB...

If I perform like a stupid User (write Tag and before the message is published i remove it from the Tag), I am able to get an error message from the NFC-Tag. It's something like "Tag I/O-Error" or "Tag I/O-Error, Tag is not ndef". So if this happens ...