P89c51rd2 isp problems

[Sreedharan Nandu]

Hi,
     I was able to program the p89c51rd2hbp cntrller with the the status and boot vector FC,00h.But as when the power reduced & when i tried to read the Status byte and Flash Magic ,it  showed the boot vector & status byte as FF & FCh with the security bits 1 and 3 set.
How can i program back the status and boot vector.Also when i try to erase ,it responses suddenly with "flash erased"and when i tried to program the flash,it responses "flash programming failed".
I need your help regarding this.

Regards,
Nandu