Hold button 3 on the phone while connecting the network cable.
Allows the phone to boot from a network-hosted image rather than its corrupted internal storage. unify devices emergency rescue tool download
The is a specialized utility developed by Unify to recover OpenStage and OpenScape Desk Phone IP devices when standard software updates fail or the device becomes unresponsive, such as being stuck in a "boot loop". What is the Devices Emergency Rescue Tool (DERT)? Hold button 3 on the phone while connecting
DERT is an exceptional-use software designed for technical professionals. It provides a manual method to push firmware to a phone using a process when traditional deployment methods—like a Deployment Server (DLS)—are unavailable or ineffective. What is the Devices Emergency Rescue Tool (DERT)
To use the tool effectively, you will need a PC, a Layer 2 network switch, and the phone's power supply (if not using PoE).
Open the application and start the built-in DHCP and TFTP services. Initiate Rescue Mode: