One Step Update (Windows Classic) today returned the CC-800 error on a checking account at BofA (all other states), but not a credit card account. There was a transaction downloaded on the credit card account (in addition to no error reported for that account). I had not deleted or deactivated the checking account nor restored a backup since the last successful download from the checking account (but not sure whether there might have been an update of the program, to R57.16, Build 27.1.57.16, since the last successful download). I tried to reactivate downloading from the checking account, and confirmed I had authorized BofA to share data with Quicken on its website. However, Quicken reported that there was one only account, the credit card account, available for downloading information.