Banana PI R4 - UART broken [solved]

Hi everyone, I’ve got a BPI-R4 and was playing around with it. I was able to install a basic Linux (Gentoo in my case) and got it to boot my kernel. Everything was working well. But when I tried to boot the BPI next morning the serial console stopped working. I get only gibberish output. Though the BPI seems to boot. It’s just the output that’s messed up.

$ picocom -b 11520 /dev/ttyUSB0
picocom v2024-07

port is        : /dev/ttyUSB0
flowcontrol    : none
baudrate is    : 11520
parity is      : none
databits are   : 8
stopbits are   : 1
txdelay is     : 0 ns
escape is      : C-a
local echo is  : no
noinit is      : no
noreset is     : no
hangup is      : no
nolock is      : no
send_cmd is    : sz -vv
receive_cmd is : rz -vv -E
imap is        :
omap is        :
emap is        : crcrlf,delbs,
logfile is     : none
initstring     : none
exit_after is  : not set
exit is        : no
minimal cmds is: no

Type [C-a] [C-h] to see available commands
Terminal ready
&0!!BL`�?=���
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,�`f IȀ`4PPN
            h�d@���ԛ`fģ$I�`4PP
                              B�
                                iB<�x��dc<�0];4P�@c�à<8w@��l!T�1*M�8MXaM~X�*MXa�0MXa�8MXa�8MX �p䇐B@��,@��bhbh�bhhbhbhb(bhbhC,�&�SD9�
                                             ��t@

                                                 �q�"
                                                    )H")x"J.L`"HD:	��b7s *pS�SJj£�P/AB
   B$IT&j�sdHd2��B03�<Yb]`<@
                            �@lx�8+	C��C�h r B`B��b"
                                                        �(%�
                                                            �(=�
                                                                �(=`
                                                                     4:���"x"�]АP`ǐF�K� h0

I get the same result for ch341 as well as for FTDI device. Any Idea what went wrong? Seems to me like a hardware defect. Can the BPI be saved?

Missing a zero…,…

Add some text for minimal characters.

@otago switch RX with TX and TX with RX on UART interface and should be ok.

Thank you very much for the hint. Yes. There was a zero missing. Adding it solves the problem. OMG. I feel like a fool now. But again thank you!