This is the UID changeable Mifare Classic 4k size card.
The UID can be modified ONLY with an external device (ACR122U).
The UID cannot be changed with NFC on Android or iOS devices.
Windows Program Download Link: PCSC_Mifare_Secure.
Notice: Google Drive may recognize the PCSC Mifare Secure program as a virus cause it can detect the USB devices which it’s necessary to connect the reader. Absolutely it’s a clean and powerful program. Download the zip file with the browser on PC.