V80 Firmware Audio BUG

Hello,
I upgraded the firmware version V80.
Everything seemed to be ok, as far as configuration and records the trunk to the PBX or to PROVIDER, but I realized that I had only the audio input, the other could not hear my voice.

I have not found anything in the configuration that might be the problem, so I was forced to downgrade to version V73.0.50 and after the downgrade, the voice output has resumed operation.

Now everything works, but I'd hate not being able to update my phone, someone happened?

The problem happened on both the T46G and T42G.

Thanks