For those who have Mib1 / Mib2 / RMC and bose or B&O, you must use this fibre optic loop adapter, in any other case bose program will cease working adequately!! The easiest way is to check the firmware Variation that may be loaded from the system. To do that, https://audimmiupdates79023.wikicarrier.com/260462/audi_map_update_secrets