We already have some version of bootloader (RS232, J1708/RS485, CAN) with encryption for different customers, some quick reference can be found here: http://www.auelectronics.selfip.com/UserManual-Au_PICBootloader.htm Funny N. Au Group Electronics, New Bedford, MA, http://www.AuElectronics.com __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist