Grandstream Networks GAC2500 Administration Manual VERIFIED Download
1. From Grandstream firmware server.Users could directly upgrade the GXP2200 to the official firmware version using Grandstream firmware server via HTTP. Please point your GXP2200 to firmware.grandstream.com and select upgrade via HTTP and reboot the phone.2. Upgrade GXP2200 via HTTP/TFTP/HTTPS.Put the firmware file downloaded from our resources library in a HTTP/TFTP/HTTPS server. Then point the GXP2200 to the corresponding server address to get upgraded.
Grandstream Networks GAC2500 Administration Manual Download