Grandstream Firmware

I have a grandstream 2140 with frimware working fine with freepbx version
any time i go past that firmware version the phone buttons do not work and if i pickup the receiver there is no dial tone, the only buttons that seem to work is the menu button. i can upgrade the firmware and the phone works fine if i have no config applied to it.

For what its worth, I have many 2140’s. I am on firmware 1.0.9.x with no issues…FYI

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