I was in the middle of trying to update firmware and realised I’d put in the wrong type of SD. I removed and then added the correct one hoe the had set is giving me 2 messages

1 ‘Loading’......but stays like this so obviously isn’t loading!

2. When I try and remove the SD or power done it asks be to insert SD and no way of getting back to the menu as the handset isn’t responding

Anyone of rebooting the handset from outside of the menu?

Any help much appreciated!