It seems they've used the same model number - ut300r2u - for different board versions. Mine looks like above. The flash chip on mine is a 48-pin one, while yours seems to be a SOP8. IC versions too appear to be different. And the board I have, uses a 10v 550ma adapter.
So the next thing I'd suggest would be to
google the broadcom chip number (not clear in your photo), find its datasheet, find out which pins are power inputs and check those. For example, the rectangular chip in the middle is RAM chip. In my case it is
K4S641632K-UC75, a 64Mb SDRAM chip. As the datasheet shows, the Vdd pin is the first pin (counting from the
indent in the corner) and the GND pin is the one directly opposite on the other row. For this model,
the naming shows that it is LVTTL and that Vdd should be 3.3v. And for the 48-pin 16Mb flash chip my board has, pin 37 is the Vcc and it needs to be around 3v (2.7-3.6v range). RAM and broadcom processor votages are the important ones, so check those first.
The four pins labeled J5 in your photo (in the top corner, near the red led) appear to be
serial port. Check their voltages to confirm TTL or RS232 and then you can try reading them using
arduino or some sort of serial to usb converter.