Chromebook Acer 11 N7 C731-C6ZT without audio

Hello everyone, I have several chromebooks of the same model and they are already at the end of their updates.
To give them new life, I installed through MrChromebox, the chromeos flex in its latest version (128).
Everything works great, except the internal audio; connected bluetooth headphones or TV via HDMI, it works without problems.

Is there any way to fix it, so that the audio works through the internal speakers?

Thank you.

Flex doesn’t have working audio on most Chromebooks, nothing can be done to make the internal speakers/mic/jack work. Buy a USB audio dongle or use BT

This is sad news, thank you very much for the reply.
We will have to migrate to a very light version of linux.