I have been successfully programming UNO boards. I wanted to transfer the project to a Pro Mini. I am using a FTDI breakout. It wouldn't show the device port. I found the device driver I was using was supplied by MatterControl. So I updated the driver from FTDI.
When I connected it I see the port available, but cannot program it. I get
not in sync: resp=0x01 avrdude: stk500_recv(): programmer is not responding
I checked in the device manager and see "USB Serial Port (COM5)" and properties shows "This device is working properly." the provider is FTDI.