How i can download NOIS 8.5.1

[#1]

Dears,

on downloads there is only version started from 8.5.2

but i need the NOIS v 8.5.1 , how can i found it or i need to open a request to get it directly from support team?

[#2]

On the downloads page, if you select NIOS Archives, you can find OVAs and BIN files for some older versions, including 8.5.1. If you need some other format, you may need to request through support.