bootloader does not work..

[bmmilk]

hi,
i hope now still can have genius here to help me solve my problem.I have built a bootloader and using the tiny bootloader software.and i hv face the same problem as here.the bootloader showed this

Connected to \\.\COM4 at 19200
Searching for PIC ...
pic sending unknown data: "K" <> 0h=
Check baudrate & Start Write while PIC is not sending serial data (e.g. in reset)
ERROR!

I'm using PIC16f877a,usb serial converter_RS232 9pin,max232 ic.i have followed schematic i google up but still cant work.hope you can help me.

[supratik]

Hi bmmilk, Can you let me know is it a blank chip? A blank chip is something whose program memory is completely erased. It could be a brand new IC or somebody has erased it purposefully. Also can you attach your schematic...

[dhouston]

http://mrmackey.no-ip.org/elektronik/ds30loader/

[bmmilk]

Hi bmmilk, Can you let me know is it a blank chip? A blank chip is something whose program memory is completely erased. It could be a brand new IC or somebody has erased it purposefully. Also can you attach your schematic...

Thank for you reply.I have tried a chip i purposely erase and also a chip with program inside.but still cannot work.when i tried to write flash the program showed the words i posted in the previous post.
http://highschoolrobots.com/serial.aspx
this is the schematic i follow to build the bootloader.what can i do with my problem?