Figure 12: GRP261X/GRP2624/GRP2634 /GRP2670/GRP2650 Unified Firmware
Dual-image Firmware
The GRP261X/GRP2624/GRP263x/GRP2670/GRP2650 series support dual-image firmware allowing the storage of two copies
of firmware on flash to avoid bricked device on unsuccessful upgrade and downtime.
The user can roll back to previously loaded firmware from the phone’s Menu 🡪 System 🡪 Alternative Firmware, and press
“Rollback”.
Figure 13: Alternative Firmware – Rollback
Firmware Upgrade
The GRP261X/GRP2624/GRP263x/GRP2670/GRP2650 series can be upgraded via TFTP / FTP / FTPS / HTTP / HTTPS by
configuring the URL/IP Address for the TFTP / HTTP / HTTPS / FTP / FTPS server and selecting a download method. Configure
a valid URL for TFTP, FTP/FTPS or HTTP/HTTPS, the server name can be FQDN or IP address.
Examples of valid URLs:
firmware.grandstream.com/BETA
fw.mycompany.com
There are two ways to set up a software upgrade server: The LCD Keypad Menu or the Web Configuration Interface.
Upgrade via Keypad Menu
Follow the steps below to configure the upgrade server path via the phone’s keypad menu:
1. Press the MENU button and navigate using the Up/Down arrow to select System.
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