AIO doesn't AIO anymore

Weird title, sorry.

Yesterday my AIO tripped the 3 breakers between it and the grid. MCB in the AIO, and both MCB & RCD in the gateway.
I’ve reset all breakers and… nothing. AIO/inverter don’t show up in the app/dashboard at all.
Pressing the “GIV” button on the side of the AIO causes that button to light up and makes the AIO beep every 2-3 seconds continuously. The AIO does then show up in the app/dashboard, complete with the ~91% SoC it had before the issue but almost zero voltage (varies between 0.0Xv to 0.6v).

Have contacted both Givenergy and the installer yesterday but haven’t heard back yet. I figure this is a significant failure of something.
Mostly wondering if anyone might know what? Or perhaps is there something I can poke to make it work again?

Cheers