<peterm6881>
the aliexpress page for the Widora TINY 200, which is what the MangoPi-R was rebadged from, says that for the R3 version, "6. The default console of USB-TTL is UART0"
<peterm6881>
and that "Support switching to start the serial port, the default is the UART1 of the R2 version of the hardware"
<peterm6881>
but in the R3c version we have, they reverted to the CH340, so god knows what they changed the uart port to