The revision and product identifier of Curiosity Nano boards can be found in two ways; either through Atmel Studio/Microchip MPLAB® X or by looking at the sticker on the bottom side of the PCB.
By connecting a Curiosity Nano board to a computer with Atmel Studio/Microchip MPLAB® X running, an information window will pop up. The first six digits of the serial number, which is listed under kit details, contain the product identifier and revision.
The same information can be found on the sticker on the bottom side of the PCB. Most kits will print the identifier and revision 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 QR-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 ATmega4809 Curiosity Nano is A09-3094.