Unable to flash rt-acrh13

I have the asus rt-acrh13. I soldered on serial wires as specified in the guide, but when I reach here:

Please choose the operation:
1: Load System code to SDRAM via TFTP.
2: Load System code then write to Flash via TFTP.
3: Boot System code via Flash (default).
4: Entr boot command line interface.
7: Load Boot Loader code then write to Flash via Serial.
9: Load Boot Loader code then write to Flash via TFTP. 0
3: Boot System code via Flash (default).

No matter what keys i press, it will always to to 3, when the guide says to go to 1. The TTL adapter works cause i can have a perfect serial console with an esp32 running tasmota (I can send down commands are receive output). Thanks in advance

I tried both picocom and screen, neither worked.