Since this device modifies the original tinySA ULTRA circuitry, tinySA ULTRA's software is unable to set up the hardware circuitry correctly, so you will not be able to use tinySA ULTRA's firmware. Since the tinySA ULTRA's firmware contains a lot of data from our frequent long-term testing, the clone manufacturer cannot make the same measurements, so even if you use their modified firmware, you will not get consistent results with the tinySA ULTRA. Typically this is worse phase noise, more spuriousness, and inaccurate power measurements at certain frequencies.