So I managed to update FW to 18.104.22.168:
Legato RTOS: 18.09.6.ALT1250.rc4 2020/10/06 17:52:39
I unpacked exe file and modified batch file inside to my COM port and run that batch file.
However still problem when downloading file larger than 170kb at 115200baud rate, it cuts transmission and returns:
then when transmission is started again first it returns missing bytes from last transmission and then continues from beginning of the file downloaded:
This happens only for larger files (I tested with 100kb and 200kb)
file content is:
then I start FTPRCV again, it returns:
I hope I explained well problem.