Flash part...so should be able to reprogram it. Using an ICD, program it...drop it in circuit, works fine. Try to reprogram it....has errors always at address 0x04.data didnt match..= so it crashes.=A0 Any ideas? --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .