1. This is a major update with bug fixes and new features. It is strongly recommended to back up all data (both configuration and application) before upgrade. After upgrading, it is recommended to factory reset the device and then restore the data back to the device.
2. Local firmware upgrade is recommended. Please download and use the utility provided by Grandstream for local firmware upgrade, avoiding Internet or power interruption that may brick the device during firmware upgrading process. Please download GS Upgrade Tool here. For detailed usage, please refer to GS Upgrade Tool User Guide.
3. Once upgraded to 1.0.4.x firmware, downgrading to any previous lower firmware version is NOT SUPPORTED.