I recently purchased a stock Alpine CM5905 for a 89 BMW 325i. It is of course asking for the security code. I opened the case to check the jumpers but it doesn't look like other instances I've seen in the past.
Here's a shot of the whole board: https://imgur.com/gbuC0FU And a closeup of what I believe to be the jumpers: https://imgur.com/xR7AXHK
I can't make out which one of these is actually soldered. Am I nuts? Or just looking at this the wrong way. Thanks.