During November 2025, Damjan Belavic enhanced device management in the nrfconnect/sdk-zephyr repository by developing a deassignment capability for device-tree devices within Xen guest domains. He implemented a wrapper for the XEN_DOMCTL_deassign_device hypercall and added xen_domctl_deassign_dt_device support, enabling runtime hardware reconfiguration without requiring guest reboots. This work, carried out in C and focused on kernel development and system programming, improved isolation and resource control for virtualized environments. By aligning with existing Xen integration patterns, Damjan ensured backward compatibility and maintainability, delivering a targeted feature that deepened the flexibility and robustness of device management in Zephyr-based Xen deployments.