I must like working on Land Rovers as I have purchased a second Range Rover, a 2000 Autobiography with a disabled engine. The logic board is at Marty's to have its brain re-set and then I hope to have a fully working RR (ha,ha). In the meantime I have removed the Alpine radio so that I can take it to the dealer where they will use the serial number to give me the radio code. In trying to get the radio out I did a search here which brought up only a few posts and no photos. I also looked at a couple of YouTube videos but still could not get the radio out using the shims I was seeing. I finally pulled the whole thing out, radio and retaining box. Thought I would post a couple photos to show what you are up against. Basically the shims you slide into the slots are supposed to depress a hook and then the radio slides out. There is a downward facing ramp on the front of the springy bar which holds the hook up. Your shim has to slide over this ramp and then all the way to the back to depress the hook fully. If the ramp has been bent upwards you may not be able to get the shim to slide over it.In that case maybe using a thinner shim and angling it upwards might get you over the ramp. Note that the photos are taken with the retaining box slid back. Hope this helps someone in the future.