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Grandstream DP750 DECT Base with DP720 Handsets
Firmware Upgrades
Log in to your DP750 base station using the web interface
The default credentials are admin / admin
Maintenance → Firmware Upgrade →
Firmware Server Path → firmware.grandstream.com
Handset Firmware Automatic Upgrade → Yes
Click Save and Apply
Reboot the base and be very patient
After the base reboots and upgrades to the latest version, the handsets will commence updating one at a time.
Be patient!