Use an SOP8 test clip to clamp onto the chip, or desolder the chip and place it in the programmer socket.
This is often the most challenging part of the repair. It is rarely found on official manufacturer websites. Instead, it is shared by the technical community on specialized forums and file archives. tp.rd8503.pa671 software
There are three primary scenarios where you will need to download and install new firmware for this board: Use an SOP8 test clip to clamp onto