This is the UID changeable Mifare Ultralight Card.
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.
Change UID with Proxmark3 X and iCopy-XS
Command hf mfu setuid --uid xxxxxxxxxxxxxx
➜ ~ nfc-mfultralight -h Usage: nfc-mfultralight r|w <dump.mfd> [OPTIONS] Arguments: r|w - Perform read or write <dump.mfd> - MiFare Dump (MFD) used to write (card to MFD) or (MFD to card) Options: --otp - Don't prompt for OTP Bytes writing (Assume yes) --lock - Don't prompt for Lock Bytes (OTP) writing (Assume yes) --dynlock - Don't prompt for Dynamic Lock Bytes writing (Assume yes) --uid - Don't prompt for UID writing (Assume yes) --full - Assume full card write (UID + OTP + Lockbytes + Dynamic Lockbytes) --with-uid <UID> - Specify UID to read/write from --pw <PWD> - Specify 8 HEX digit PASSWORD for EV1 --partial - Allow source data size to be other than tag capacity