MC60 Modem firmware quecfota upgrade issue

We have been working on upgrading modem firmware using QuecFOTA_V1.4.exe utility. we are providing gateway of serial port to upload Modem firmware. we are following Modem On off sequence and bin file selected from upgrade folder, baudrate is also same at both side. still we got sync error while we start modem upgrade process.

Can anybody please share the procedure of upgrading firmware using QuecFOTA_V1.4.exe utility?

You also need to select this and then upgrade: