Hello,
The MX usb loader uses UART/USB converter to work with UART ports of i.MX.
This may provide some problems, in particular "the UART link [host side - Yuri] uses
hardware flow control using RTS/CTS, so make sure those are available".
Please check if the converter provides the needed settings for i.MX6 UL UART, as shown
in Table 8-39 (UART Configuration Details) of i.MX6 UL RM (IMX6ULRM, Rev. 1, 04/2016)
Regards,
Yuri.