I just successfully updated a known-working Grandstream GXV-3240 telephone from v220.127.116.11 to v18.104.22.168 (released as official yesterday) via TFTP on local PBX, and the telephone now gets ‘No IP’ on the new firmware. All programming appears to be there, and everything appears to be working (including PoE)… except the crucial ability to get on a network. I tried changing the telephone from DHCP to a Static IP Address, but it was still inaccessible.
As a workaround, I was however able to get the telephone on our company WiFi network. As I have no idea what is going on with the new firmware, I’m attempting to downgrade it to the last v22.214.171.124 firmware that it had been running for quite some time. I reviewed the release notes, and am hoping someone knows/sees something that I don’t.