1. 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.
2. Two different firmware packages are available depending on the current firmware version of your GDS3710. If GDS3710 is on firmware 1.0.3.x or higher version, please download firmware package that has single firmware file here. If GDS3710 is on firmware 1.0.2.x or lower version, please download firmware package that has multiple firmware files here. Please make sure to download the correct package for upgrading, and do not mix the two firmware packages.