Help - mute button?

[sectoid1]

Hi All,
I have a tiny problem with the sound on my vu+ duo2. My son has been playing with the remote (the same genuine as this one: https://www.world-of-satellite.co.uk...Remote-Control) and he pressed some button/combination of buttons and muted the sound. I cannot unmute it now (I'm not talking about the mute button in the top right corner of the remote - this controls my sound bar). The mute icon appears on the top of the screen.

IMG_20200218_200316.jpg

I have the latest update of openvix installed.

How to unmute this, please? What button on the remote controls it?

Thank you for your help!