Cisco IOS XR images are copyrighted. You must have a valid Cisco service contract or a CML Personal/Plus subscription to legally download this image.
This is the core of your search. You cannot find this file on random file-sharing sites safely (many contain malware). Here is the legal pathway: Xrv9k-fullk9-7.2.2 Download
The Cisco ISR 900 series is a series of routers designed for small businesses and branch offices. The IOS XE software is the operating system used on these routers. This guide provides step-by-step instructions on how to download and install the Xrv9k-fullk9-7.2.2 IOS XE software. Cisco IOS XR images are copyrighted
/opt/qemu/bin/qemu-img convert -f qcow2 -O qcow2 xrv9k-fullk9-7.2.2.qcow2 hda.qcow2 You cannot find this file on random file-sharing
As this is a virtual router, you must download the software directly from Cisco.com (requires a valid CCO account) and install it on a supported hypervisor. Cisco XRv 9000 - - EVE-NG
Once logged in (default credentials: root /no password, then sysadmin-vm user), configure the management interface: