Instructions to install a USB type A connector in the WRTU54G-TM

1 - Lift pin 21 of the SimPro chip
2 - remove R651, R652 and R653
3 - pin 1 (V+) of the USB type-A connector to pin 22 and/or 23 of the SimPro chip
4 - pin 4 (GND) of the USB type-A connector to pin 2 and/or 3 of the SimPro chip
5 - pin 2 (D-) of the USB type-A connector goes to the pad of R652 that's farthest from the Simpro chip
5 - pin 3 (D+) of the USB type-A connector goes to the pad of R653 that is farthest from the Simpro chip

- Thanks to this post by ccase.

The power bus is 5V, but the signal levels at Low-speed/Full-speed are for 3.3V rail
(min = 2.8V and max = 3.6V for high level). See Table 19-2, page 518 in
USB Complete, 3rd Edition.

Found the above in a forum post about another microcontroller at 3.3v levels. Basically, USB2.0 isn't going to work without a buffer, and not much power is coming off the power rails. So, a powered USB1.1 hub should allow most success :)