Important: the designers have informed us that boards assembled with CH334F chips that are marked 13122E20 will not work unless resistors R54 and R55 are removed. CH334F chips with batch code 1163FD43 are not affected and will work with the resistors in place. Since the board will work either way without those resistors, you may wish to omit them from the list of parts to solder to the board.
