> 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

### 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="/files/v83JRg7sfhxTnP5nmWk7" alt=""><figcaption></figcaption></figure>

### Configuration

<figure><img src="/files/AdxbxvLzIdJQo6ZuK9Mj" alt=""><figcaption></figcaption></figure>

### How to change

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