Footage of Shahid Moghaddam and colleagues observing solid fuel engine tests, likely 13-15 years ago
The second engine possibly was intended to serve as the second stage of the "Ghaem" SLV/ICBM
It's clear that the loss of Shahid Moghaddam and his team set Iran's long-range missile/SLV efforts back at least 10-15 years and all their efforts were essentially lost.
Although new solid-fuel projects emerged in their place and have begun to bear fruit in recent years (e.g. Raafe), we still have not seen a engine larger than 1.5m diameter (in the same class as the Ghaem first stage engine which likely dates back to c. 2008-2010)