If you have an older .bin file for legacy routers like the Cisco 3725 or 7200, do not convert them to .qcow2 . You should use them natively via the Dynamips emulator within GNS3 or EVE-NG . Upload the .bin file directly to GNS3 or EVE-NG.
qemu-img create -f qcow2 cisco.qcow2 8G
Use binwalk to scan the file structure. Binwalk looks for file signatures (magic numbers) to identify embedded data. convert cisco bin to qcow2
Prerequisites