Hey, I have an arduino clone with 32u2 on it for usb to serial converter. Recently, the board started to refuse uploading sketches. I'm planning to refresh the bootloader of the usb to serial converter. However, I cannot find the combined dfu usb serial hex file for 32u2 which means I have to compile it myself. However, the combined dfu usb source is not provided and it couldnt find it anywhere. Can someone help me get the combined dfu usb source?
Now to clarify certain things. To reflash the chip and get it to work properly, I need to be programming the bootloader area of flash, right? A simple ordinary flashing using an ISP wouldn't work, right?