How to use usb to ttl for install OpenWrt in Archer D50

Any help to use USB to TTL for install OpenWrt in arch d50

and how to check rx and dx


@ slh

after following me the explanation here:;a=commit;h=f5d2c91415a68f554815860d574145644fc31c16

not work from me
look this message:

Board IP address                  :  
Host IP address                   :  
Gateway IP address                :  
Run from flash/host (f/h)         : h  
Default host run file name        : vmlinux  
Default host flash file name      : bcm963xx_fs_kernel  
Boot delay (0-9 seconds)          : 1  
Board Id (0-4)                    : 96318REF  
Number of MAC Addresses (1-32)    : 11  
Base MAC Address                  : 02:10:18:01:00:01  
PSI Size (1-64) KBytes            : 24  
Enable Backup PSI [0|1]           : 0  
System Log Size (0-256) KBytes    : 0  
Auxillary File System Size Percent: 0  
Main Thread Number [0|1]          : 0  

*** command status = 0
CFE> tftpboot 0x81000000 openwrt-ath79-generic-tplink_archer-d50-v1-squashfs-sysupgrade.bin
Invalid command: "tftpboot"
Available commands: phy, sm, dm, w, e, r, p, c, f, i, a, b, reset, force, help

*** command status = -1

You connected to the wrong UART, the Broadcom one, not the QCA one.

Be very, very, very sure what you're doing, you might not have second chances taking a wrong step.

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