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  • Why have you disabled Bluetooth? Why are you you using obsolete cmdline settings? Commented Feb 26, 2020 at 11:50
  • Correct me if I'm wrong, but your issue is that your computer won't recognize a USB to UART dongle (code 71 means "no response packet received within the prescribed bus turn-around time", meaning the device is not replying to USB commands). This is not really a Pi-4 related issue. Commented Feb 26, 2020 at 12:02
  • @DmitryGrigoryev I've tried this with 3 other cables, they all report the same and go extremely hot. Could you please suggest the right way to connect it? Commented Feb 26, 2020 at 16:26
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    @Milliways I might've read this page incorrectly then. Hence the question. Sorry, if I'm wrong. What is the correct cmdline? Commented Feb 26, 2020 at 16:27