The fastest, easiest way is to go to eBay and search for "Becker 220 radio unlock code".
There are several different folks that will send you the unlock code for $7-10. I've used them several times in the past. They usually email a code within a couple hours. Overnight at the latest.
Yes - you can wait for someone to eventually come along or find someone on the forums that will find it for you, but in the time it takes you to read this, you can be on eBay getting your code.
It's worth the couple of dollars to me to just get the code and be done with it.