There’s a NEW feature on Ver.20200223_R1 of MTools, named Infinite Clone, which will help you to clone Mifare Classic Card and Mifare Ultralight Tag much easier and save your time.
How to Use
- Import a dump file or scan from the source card firstly.

- Click on dump item and choose Sector 0.

- Click CLONE Button.

- Put the CUID card close to the NFC antenna.

Other Tips
- Only CUID card’s block 0 can be written by NFC.
- MTools will verify the BCC byte and SAK byte of sector 0.
- Manual overwrite invalid block 0 of sector 0 will cause unrecoverable damage to the card.
- CUID card doesn’t work on the backdoor command.