Porting C code from P89C51RD2BA to P89CV51RD2FA

Hello, I have written C code for P89C51RD2BA.And this code works well with the application. Because P89C51RD2BA is obsolete I have selected P89CV51RD2FA.But when I ports .hex for P89C51 to P89CV51 application doesn't work at all. Please tell me where the problem is?

Thanking you.

Regards,
Abhijeet R. Mudgal.

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