How to modify the default UID for NFC phones

As a general NFC mobile phone using NXP or Broadcom scheme, the modified method is not the same, why to modify this ID, followed by, in general, the phone's uid is fixed or random

Broadcom Mobile Phone Modification method

Modified path, such as the map, in the ETC directory has libnfc-brcm.conf, from the file name can also be seen BRCM is Broadcom abbreviation, so only the use of the Broadcom program mobile phone Only this file, open and find nfa_dm_start_up_cfg

The code is as follows

Copy Code

############################################################################### # Startup Configuration (bytes maximum) # # for the 0xCA parameter, Byte[9] (marked by ' AA ') are for UICC0, and byte[10] (marked to BB) is # for UICC1. The values are defined as: # 0:UICCX only supports ISO_DEP in the low power mode. # 2:UICCX only supports Mifare in the low power mode. # 3:UICCX supports both ISO_DEP and Mifare in ' low ' power mode. # # AA BB nfa_dm_start_up_cfg={2e:cb:01:01:a5:01:01:ca:14:00:00:00:00:06:e8:0 3:00:00:00:00:00:00:00:00:00:00:00:00:00:80:01:01:C2:08:61:40:82:04:40:4B:4C:00:B5:03:01:02:FF}

Added in curly braces, the 0x33 represents the UID number, the second byte uid is length, such as 0x04, the length of the card number is 4 bytes, followed by the card number, such as 01,02,03,04, and the modified data is:

The code is as follows	Copy Code
{2e:cb:01:01:a5:01:01:ca:14:00:00:00:00:06:e8:03:00:00:00:00:00:00:00:00:00:00:00:00:00:80:01:01:c2:0 8:61:40:82:04:40:4b:4c:00:b5:03:01:02:ff : 33:04:01:02:03:04}

After the change, restart the phone, you can use Taginfo app read card number is modified successfully:

NXP Program Phone Changes:

Find libcnfc-nxp.conf in etc directory

Change the 04 in the graph to the length of the UID, followed by 01 02 03 04 As the specific content of the UID.

Precautions:

1. After the change to restart the phone, and then read with Taginfo to see if there is no success

2. If Taginfo can't read the UID of the cell phone, try to read it in standby screen.

The reason for reading in 3.2 is that the Android beam is turned on and the android beam is turned off to try and read in the normal interface

4. If you don't want to change the system files, here's an app that you can try

Mobile NFC Chip Summary

Cell phone	Chip
Millet 5	NXP 66t17
Millet 2A	NXP 44701
Millet 3	Broadcom 20793M
Iphone6	NXP 65v10 (PN548)
Iphone6s	NXP 66V10
Nexus 6	Broadcom BCM20795
Nexus 7	NXP 65n04
Nexus 5	Broadcom bcm20793m
Nexus 4	Broadcom 20793S
Nexus 6P	NXP PN548
Nexus 9	Broadcom BCM20795
HTC M8	NXP 44701
Vivo Xplay	NXP 44701
Moto x	NXP 44701