I recently upgraded to a MKIV Nav unit in my 2000 740i, and have three problems that I'm aware of. First is the voice guidance, instead of a voice, I only get a loud buzz. On two rare occasions the voice did work,but 99% of the time it buzzes. Next is the readout under the speedo on the instrument cluster. It was in English before the upgrade, now it's in another language..I think it's telling me "key in ignition", or "door ajar", or "fasten seatbelt", etc., however the radio info is in English. Third issue is the date won't set that displays on the wide screen, lower right. All info on the nav screen is in english. I've done a lot of reading and have learned the different OS versions that the nav units use. Mine reads
SW4-1/02, which in all my readings, I haven't seen the 1/02 listed. (I've seen referance to 4-1/91,
4-1/00, but not 4-1/02). Should I learn how to and install V30, or V31? I've also read about Nav Tweak and NavCoder software. Will this correct my issues? I'm very new at this and before these issues, didn't realize recoding could be done, and it's taking a lot of time to read and get a somewhat working knowledge of all this. I am willing to buy the necc. software and connection cables to try and figure this out, but I should could use some guidance and help ubderstanding this. Thanks in advance