Only way to reset it is with a Peake SRS reset tool. Unfortunately, you can't get creative with a paperclip like you can to reset the oil service lights. You can try going to an independent shop that specializes in BMWs (or Euro cars in general), and they should have the Peake tool. Otherwise, you're stuck going to the dealer, who may or may not charge you to reset it depending on their daily mood.
1998 BMW 328is
1966 Pontiac GTO
2007 Subaru Impreza 2.5i 5-door
View my photos: Caught in the Wild