You may have to program the bootloader first using some sort of BDM or JTAG device. There are various devices out there depending of which PIC you are using.
Maybe I misunderstood. DOes the PIC already have a bootloader? If so, if you have the command to transmit the hex file through the serial port, you can implement it using the Serial Port vi's.
Typically, a download is done by blocks. You can create a loop which reads and writes the hex file in the appropriate block size. The trick is that your hex file is probably in binary format and you may have to convert it to text to send it through the serial port.
If this is what you are looking for, I can give you details on how this is done. I do not have a ready-made vi for the PIC.
JLV
