There is a fix for Sony stereos - but I can't remember for the life of me where I read it.
Take this with a pinch of salt!
Remove the stereo, on the underside there is a sticker which covers up an access hole to the circuit board. Under this sticker there is 4 solder points, if you solder all 4 to each other, it blanks the requirement to need a code.
Or something like that
