Hi. I bought this device off eBay (link: https://www.ebay.co.uk/itm/262446881168) and connected it up to my Alana head unit (Ibiza 2006 reg). However, when I press the CD6 button on my head unit, it just displays 'CD Changer' on the screen but the radio continues to play. I have it connected to an MP3 player but it doesn't seem to pick it up. I read somewhere that the earth connection from the device can be temperamental (i.e. the one that connects to the screw thing at the back of the head unit), resulting in the device not working properly. Any advice would be appreciated. Thanks.