Thanks!

The only thing if using usb to serial converter, most probably we need to use the hard reset button to pull the MLCR to Gnd. Is the above statement true?

If the loader file that I have only provided in 4Mhz and 20 Mhz, but i want to have the INTRC Clock Out as the clock system, what should I do? It is possible to modify the hex value in the bootloader file according to the configuration hex location?

Sorry! so many question here.

Thank very much.