Transfer per XMODEM omits last byte of CRC Checksum

[Paulemeister]

I am transferring firmware to a device through teraterm via XMODEM. I am using Version 4.85 (pre change of XMODEM where CRC and Checksum can be selected manually). This version works fine and succeeds in transferring the data.

Wanting to update to the current version 5.3, the transfer fails. I attached the XMODEM.LOG for both versions.
I calculated the CRC-16 CCITT for the data of the first block.
Both calculate it right and send it correctly the first time, as the receiving device sends a 'C' signaling it wants to use XMODEM-CRC.
I don't know why the first receiving of the first block fails, but after a 'NAK' from the device, the new version continues sending only one of the two bytes of the checksum.

I checked whether that byte is the checksum (sum of data mod 265) but that is not the case, it also doesn't seem to be a different CRC-8 (using this website).

It seems like the new version is just not transmitting the second byte of the CRC

Thanks for the help

4.85_XMODEM.LOG

5.3_XMODEM.LOG

[zmatsuo]

Thanks for the report.
I will investigate.