MC3190Z - Error Changing EPC ID of RFID tags

Hi, as the title says, I am having a hard time changing the EPC ID of RFID tags...

So far, I have managed to write in the USER memory bank. But when I try to modify the contenct of the TID memory bank, I get a memory locked warning. So I assumed that this field cannot be changed and that the manufacturer of the tags locks the TID part of a tag. Moreover, whenever I try to write in the EPC memory bank, I get the following error:

C1G2WriteOpSpecResult failed: Specified Memory does not exist or is not supported by the Tag.

Thanks in advance,

Mokdad