Programming AT89c51

Making an lcd digital watch alarm and thermometer. C source code downloaded converted that C file to Hex using KEIL and now I want to program it in chip. I have Universal programmer BEE PROG +. When I select chip and load. hex file in software, I write data without problem. When I read data in chip I see that Software Write that in mdle of chip memory and. hex characters are changed. When I compare it

with hex workshop I see that there are a lot changes and my project don`t work. My pcb is ok 100% onlay what I have is backlight on my 16X2 lcd screen.

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