On the Peplink website here
https://www.peplink.com/support/downloads/
the file downloaded for the latest Surf SOHO firmware is
fw-max_br1mk2_hotspot_sohomk3-7.1.2-build1387.bin
However, on my Surf SOHO, I had the router itself check for new firmware and install it. After rebooting, the router is firmware 7.1.2 build 3310.
Why the different builds? Thank you.