I assume you did not change the bootloader? So the board still works with the arduino software?
And you will see the COM port in windows device manager?
It should be possible to program with bascom using the arduino programmer option. Select Ardunino programmer, proper COM port and 19200 baud. Using F4 the board should be programmed same as with arduino.
But your first step should be to check if the driver is working and the simplest thing to do is check with arduino software.
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