There are two common ways to make this firmware "work" on your access point:

: Many used Cisco 3700s are sold as AIR-CAP (Lightweight) models; this file is the "magic key" needed to convert them to Autonomous . Installation Guide

This firmware is primarily sought after by network administrators for:

AP 3702i - IOS version for Autonomous Mode - Cisco Community

If your AP is currently in Lightweight mode or the bootloader is stuck, use this method:

: Indicates that this is Autonomous software. (In contrast, k9w8 is for Lightweight/WLC-managed mode).

: Refers to the internal hardware generation, specifically for the Aironet 1700, 2700, and 3700 series.