Really nice product, I think....
I've purchased two of these things thinking the first might be defective as I couldn't get any sort of clear readings out of it even when I connected the UART lines to an oscilloscope.
I'm an electronics engineer and I don't see any issues on my end, I can't even get the simple LED program to work for engine RPM over 2000.
I've tried it on a 1999 and a 2000 Firebird with no results. But cars OBD ports work fine with all other scanners.
Really is a shame, would love to figure it out finally