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Disable/remove security bits in P89C51RD2

Utsavi Bharuchwala

Hi,

I am working with P89C51RD2HBA(PLCC package).

When I start to download .hex files using flash magic , "Security bit 1 is set" message is displayed.

And from ISP->ReadSecurity, I come to know that Security bits 1, 2 and 3 all are set.

Using WinISP, I can blank check, I can erase but when I press program part it shows,"Flash programming Fail"

How to remove this security bits?

Regards
Utsavi Bharuchwala

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