This is the B200 one I used only about £50-60, (cheaper than the price of just one BMW Dealer SRS reset in the UK) and always available to use again in future once you have it.
BMW AIRBAG SRS FAULT CODE SCANNER/RESET TOOL
I guess how it works is that it is custom made to see & read only the BMW unique SRS Airbag manufacturer codes and reset them, rather than the common engine codes,etc. of the OBD-II scanner you have been using?
ie. your fault code is their but can not be seen and recognised by a non BMW type scanner.