I have a CPE510 V3.20 in U.S.

I am looking for the latest firmware. When I got to the U.S. support site for it: https://www.tp-link.com/us/support/download/cpe510/v3.20/ 

It has other hardware versions firmware, but no v3.20

Currently:

Device Model: CPE510 v3.20

Firmware Version: 2.2.1 Build 20200612 Rel. 38059 (5553)

What is lates and where can I get it?

THANK YOU!