odd erros

Hi
I have written am tiny bootloader to program 80C597AF and it works fine few days before but suddenly it stop working and show me error;

Searching CPU not found

I have also tried some other circuits to program the device using bootlaoder but same error

I have also TX and RX data from circuit using HS -ief serout command (erasing Bootloader and then burn hex file from programmer) of Samload and it is working so this means circuit is OK and serial Cable is also OK now what the hell is the problem i dont understand it. Please Help me in solving my problem and if anybody has any idea then please share it.

 You wrote the bootloader, so ...

Ask yourself: What causes "Searching CPU not found" to be shown?

 what does this have to do with Keil?

of Samload
contact Samload support

Erik