not able to write to external serial flash when chip select used other than SS

Hi,
i am using Atmega8A and trying to copy data from Original flash ic to New flash ic upto 3 numbers. The chip select of New flash ics are connected to PC0, PC1 and PC2 respectively, whereas Original flash ic chipselect is connected to SS.

When i execute the WREN command for the new ics, it always return as WIP (write in progress). But if i do the same for the original ic that is connected to the SS pin, it responds correctly.

I have gone through the old fourm discussion on the SS pin correct configuration but still not able to get it working for my setup.

Hey guys anyone of you have encountered this problem and have got a solution please help me out!!

Thanks