I think the bootloader for PIC16F877A must be diferent, I tried with PIC16F877-20, and that works fine, But when I tried to use the same bootloader with PIC16F877A, I received message "reset required", I donot have harware problems, because is the same circuit, but only change the PIC, and I tried with diferents IC, for that I think the problem is the bootloader,
My question is: Exist a bootloader for PIC16F877A?