You must upload the file ending in .bin , not the .zip archive. In the UCM Web Interface, go to Maintenance > Upgrade .
The upgrade process requires a full reboot, which will terminate active calls and drop all registered IP phones for 5 to 15 minutes.
Download the specific firmware ZIP file from the Grandstream support site. ucm6202 firmware
Conduct a quick inbound and outbound call to verify the audio codecs are processing correctly. Troubleshooting Common Firmware Failures Probable Cause Corrective Action "Invalid File Format" Error
Firmware updates require a system reboot, which will drop all active calls and take the phone system offline for several minutes. How to Upgrade Your UCM6202 There are two primary methods for updating your device: Method 1: Automatic HTTP Upgrade (Recommended) You must upload the file ending in
Latest Stable Release (e.g., 1.0.22.x or higher)
The UCM6202 runs a customized embedded Linux system, combining: Download the specific firmware ZIP file from the
Upgrading and maintaining the firmware on your Grandstream UCM6202 IP PBX Go to product viewer dialog for this item.