There are two ways to find the revision and product identifier of the Xplained Pro boards: either through Atmel Studio/MPLAB® X or by looking at the sticker on the bottom side of the PCB.
When an Xplained Pro MCU board is connected to a computer with Atmel Studio/MPLAB® X running, an information window with the serial number is shown. The first six digits of the serial number contain the product identifier and revision. Information about connected Xplained Pro extension boards is also shown in the window.
The same information can be found on the sticker on the bottom side of the PCB. Most kits have stickers that have the identifier and revision printed in plain text as A09-nnnn/rr, where nnnn is the identifier, and rr is the revision. Boards with limited space have a sticker with only a data matrix code, which contains a serial number string.
The serial number string has the following format:
"nnnnrrssssssssss"
n = product identifier
r = revision
s = serial number
The product identifier for the ATtiny817 Xplained Pro is A09-2654.