> For the complete documentation index, see [llms.txt](https://docs.mtoolstec.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.mtoolstec.com/how-to-use-uid-changer.md).

# How to use UID Changer

PN532 and ChameleonUltra can change the UID of Gen1A, Gen2, Gen3 and Gen4 Magic Card. And MTools Lite brings the UID Changer for all magic cards.

### Supported Readers

1. [PN532 BLE](https://shop.mtoolstec.com/product/mtools-all-in-one-pn532) or [PCR532](https://shop.mtoolstec.com/product/pcr532)
2. [ChameleonUltra](https://shop.mtoolstec.com/product/chameleon-ultra)

### Supported Magic Cards

#### Gen1A

* [Mifare S50 with 4 Byte UID](https://shop.mtoolstec.com/product/uid-changeable-nfc-mifare-s50-keychain)

#### Gen2

* [Mifare S50 with 4 Byte UID](https://shop.mtoolstec.com/product/uid-changeable-1k-s50-chinese-magic-card?attribute_pa_card-type=cuid\&attribute_pa_amount=1-pc)

#### Gen3

* [Mifare S70 with 7 Byte UID](https://shop.mtoolstec.com/product/7-byte-uid-s70-4k-magic-key-fob)
* [Mifare S70 with 4 Byte UID](https://shop.mtoolstec.com/product/4-byte-uid-s70-4k-magic-key-fob)
* [Mifare S50 with 7 Byte UID](https://shop.mtoolstec.com/product/7-byte-uid-s50-1k-magic-key-fob)
* [Mifare S20 with 7 Byte UID](https://shop.mtoolstec.com/product/7-byte-uid-changeable-mifare-mini-s20-card)
* [Mifare S20 with 4 Byte UID](https://shop.mtoolstec.com/product/4-byte-uid-changeable-mifare-mini-card)

#### Gen4

* [Ultimate Magic Card](https://shop.mtoolstec.com/product/ultimate-magic-card-gen4)

### Card Type Selection

<figure><img src="https://3395533350-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LD97pa04tZLvlPyG5f6-887967055%2Fuploads%2FzchIwUhoyUlmswYVZpNA%2FUID%20Changer%20-%20Card%20Type.png?alt=media&amp;token=161c6907-8d1c-4fe3-85a4-e7886895ecd0" alt=""><figcaption></figcaption></figure>

### Configuration

<figure><img src="https://3395533350-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LD97pa04tZLvlPyG5f6-887967055%2Fuploads%2FgYQgih0tjm9ZQS5jNCAy%2FUID%20Changer%20-%20Configuration.png?alt=media&amp;token=16e11468-ed36-45d7-8cca-7a48368c28e9" alt=""><figcaption></figcaption></figure>

### How to change

1. Input the valid information.
2. Click **Execute** to change the UID.