Dear all!

I am writing an application in C++, which writes Contact No, SMS, URI into a Mifare 1K NFC tag using ARYGON's NFC Desktop reader.

While playing with one of the mifare tags, accidently i have written the following data A0A1A2A3A4A5078F0FC1D3D7D3D7D3D7 in block 3 0f 0th sector,
now i am unable to change the key, since the previous access control bits made it read only!

Can you please help me to change the key as well as contol bits of the block 3
Thanks!