Somebody help me.

I was able to write and read the data on my SLE4442 Smartcard with PSC code of 0xff, 0xff, 0xff. I run my program and write 5 different data at starting address 0x50 then read the 5 data with the same address and its working correctly. I tried to do it again with different data on the same address and read it again correctly. But why when i turned off/on my circuit and run the same program with different data on the same address seems writing is not working and all i can read is the previous data.

I tried the same procedure with other cards and the same results happened. My PSC is 0xff, 0xff, 0xff and i don't changed it as i run the same program.

Can somebody help me, pls!

Matthew