refers to the hardware platform (AP1700), and k9w7 indicates this is a WLC-based (Lightweight) image , not an Autonomous one (which would be k9w8 ).
Signifies that this is an Autonomous (Standalone) image. Access points using this image can be configured and managed individually without a Wireless LAN Controller (WLC). (In contrast, w8 images are "Lightweight" and require a controller to function). Ap1g2-k9w7-tar
Note: Image must be named exactly as ROMMON expects. ap1g2 refers to the hardware platform (AP1700), and
.tar file in the TFTP root folder.tar -xtract tftp://<PC_IP_ADDRESS>/ap1g2-k9w7-tar.<version>.tar flash: