Ok heres what I did from the beginning of this post. 1. Used unofficial 3A 24AWG power supply. Getting errors on my Raspberry Pi 3B. Then, I changed the power supply for the official Raspberry Pi 2.5Amp 18AWG 5.1v power supply. Same errors. I plugged in my Raspberry Pi 3B+ with the 3Amp power supply, tried the rtl sdr test and succeeded. So it is NOT the power supply. Also it is not USB, its just a unremovable power supply with wire.
