Grumpy_Mike:
The RFID card dump will be all the information on the card including the serial number. Can you post the output of this code for two cards.
Here is the dump info for the tree card
Firmware Version: 0x91 = v1.0
Scan PICC to see UID, SAK, type, and data blocks...
Card UID: 04 08 7A 04 04 15 45
Card SAK: 00
PICC type: MIFARE Ultralight or Ultralight C
Page 0 1 2 3
0 04 08 7A FE
1 04 04 15 45
2 50 00 00 00
3 E1 10 12 00
4 01 03 A0 10
5 44 03 00 FE
6 74 72 65 65
7 31 32 33 34
8 35 36 37 38
9 39 30 31 32
10 00 00 00 00
11 00 00 00 00
12 00 00 00 00
13 00 00 00 00
14 00 00 00 00
15 00 00 00 00
this is the dump info for the apple card
Card UID: 04 08 7A 04 04 16 80
Card SAK: 00
PICC type: MIFARE Ultralight or Ultralight C
Page 0 1 2 3
0 04 08 7A FE
1 04 04 16 80
2 96 00 00 00
3 E1 10 12 00
4 01 03 A0 10
5 44 03 00 FE
6 61 70 70 6C
7 65 31 32 33
8 34 35 36 37
9 38 39 30 31
10 00 00 00 00
11 00 00 00 00
12 00 00 00 00
13 00 00 00 00
14 00 00 00 00
15 00 00 00 00