Check out the BCA blog link. There should be instructions there as to what you have to do. I didn't read the fine details. You may need to go into a retailer, send it to BCA, or you can do the fix yourself. I do know that your unit will need a software update to fix the issue.
I know some people in town here who had affected beacons. They sent their beacons in and got them back in under a week. I think for as to how long you'll be without a beacon is based on what shipping you use.