If i take a data cable,M/F bus and stick at the serial end a male-female null modem, would i be able to use it as a flashing cable?

Also, does the cheap flasher support flashing newer cellphones like 3650 etc...?
If i build a cable and get the necessary software, what would i still need?

I'm guessing i would have to upgrade the dongle somehow or use appropriate software for it?

Does flashing and upgrading (MCU+PPM) remove simlock?

Thanks for the help.