The first GEN UID chip and the GEN2 UID chip use different commands, so they need to use different software to operate. The second generation uid is also known as cuid.

1,The first generation uid used the back door command. The command of uid sector is different from that of other sectors.

2,The normal commands used by the second generation UID cuid are the same as those used by other sectors

This means that if your software is used in the first generation card reader, it can not be used in the second generation card reader. The second generation reader can use Android NFC to rewrite uid compared to the first generation reader 

If you don't have the software to write the second generation uid, even if you have professional equipment, I don't recommend buying this product. Of course, if you have an Android phone with NFC, you can modify the uid with MCT software

Item Compatible with S50, Support Android APP MCT(Do not provide, download it via play store by yourself.)

This card works the same as the normal IC card,Only the Sector 0 Block 0 which is

known as the serial No.block(UID)could be programmed to any UID you want.

 Could be modified many times

Organized in 16 sector with 4 blocks of 16 bytes each(one block include 16 bytes)

Frequency:13.56MHz

Protocal:ISO1443A

Capacity:1K byte EEPROM memory

Rewrite times:100,000 times

Read distance:0-10Cm(depend on the R/W device)

Material:PVC

Size:84*54*0.8mm

Quantity: 10PCS