bootloader does not work..

[bmmilk]

What speed crystal are you using on your PIC16F877a, and which hex file are you using? Do you have a schematic of your PIC16 chip setup?

I'm using 4MHZ crystal. the hex file is tinybld_16F876A_04MHz.
ooppss,i dont have schematic of my pic setup.but it works well when i use a programmer to program instead of trying to build a bootloader.