My radio stopped working and red light stopped flashing.

I had to charge the battery after 8 months of winter storage. Now nothing HELP PLEASE

You need the code. Enter it and all will be good. If you haven't got it, look in the owners manual, or slide the radio out and maybe someone wrote it on the radio, (if you are lucky). You must have the right (mini- 3mm?) size allen screws to remove it.

Look at your paperwork from when you got the car like Gen says, most people write the code down in at least some obvious spot. If not you will need to either take the car in to BMW dealer and verify your vin and they can pull the code or take the radio in and again verify you are the owner. That is messed up stuff for such old radios but it is what it is. No hacking it.