Hello sir,
Regarding PN5190, We only have 2 launched versions of the IC. Version B2 and B1 are shown in the Datasheet. You shouldn't have any issues in case you are attempting to update the secure firmware it is highly recommended to upgrade to the newest version available v2.f6. Still, the functionality of your application shouldn't present any issues.
Regarding the Automatic antenna tunning, please keep in mind that the tunning of the antenna still requires some work depending on the antenna type.
AAT is only a complementary feature and by any means replaces the hardware work that a new antenna design requires.
Please take a look at the following link: https://www.nxp.com/products/rfid-nfc/nfc-hf/nfc-readers/nfc-frontend-supporting-challenging-rf-envi...
In the section Software, you will find the Binary Files (FW6590) and the Firmware example code (SW6592).
Additionally to this, please take a look at the Quick Start guide for steps by steps.
Best Regards,
Fabian