https://gitlab.synchro.net/main/sbbs/-/issues/595#note_7658
Looks like sexyz's ZMODEM implementation doesn't like Tera Term's *but lsz is more tolerant):
```
[52624] SEXYZ: Sending ZRQINIT
[52624] SEXYZ: zmodem_get_zrinit
[52624] SEXYZ: zmodem_recv_hex_header HEX header not terminated with LF: 141 (8Dh)
[52624] SEXYZ: zmodem_recv_header detected an INVALID HEADER
[52624] SEXYZ: zmodem_send_file UNEXPECTED Invalid Header received instead of ZRINIT
```
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