Dear all, I try the bootloader which coming from http://www.workingtex.com/htpic/PIC_bootloader.htm with my PIC16F876, running at 2MHz. Since the 2MHz fosc hex is not available, I assemble the hex by my self base on the bootloader asm source ver2.2 If the watchdog NOT flag not turn on, then the bootloader run without any problems. But if watchdog is on, then nothing run. Would any one help? Becase my design need watch running. Thanks in advance Ken _________________________________________________________________ (O%N MSN Messenger ;P*B$M&b=u$W2a$Q!Ghttp://messenger.microsoft.com/tc!C -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.