There is no need to use the UEXT. Each of the signals that is available at the UEXT, is also available at a drill at the two sides of the board (the two rows of pin drills).
For example, RXD is GPIO3 and TXD is GPIO1.
QuoteI want this board because it is FCC and CE certified (avoid the huge cost of certification on my own).
Our boards are not FCC nor CE certified. The WIFI chip is certified but the whole board has never been submitted for testing.
If you still need modifications made to the design, either use our open hardware design or contact us at firstname.lastname@example.org with requirements.