ZoLArk173 / Android_NFC_FIXED_UID

A solution for setting a fixed NFC UID for Android phone

Requirement

• NDK
• Rooted android devices with NFC

Instruction

1. Git clone the project to local.

   $ git clone https://github.com/ZoLArk173/Android_NFC_FIXED_UID.git
   $ cd Android_NFC_FIXED_UID
   // Since there are some parts of code belongs to other repositories, we need to clone them as well.
   $ git submodule init
   $ git submodule update

2. Change the desired UID inside Android_NFC_FIXED_UID/UidCtrl/main.cpp

3. Inside Android_NFC_FIXED_UID/Application.mk, change the APP_BUILD_SCRIPT := path/to/Android.mk to the path of Android.mk under project root folder.

   (ex: APP_BUILD_SCRIPT := /home/zolark173/Documents/Android_NFC_FIXED_UID/Android.mk)

4. Run ndk-build NDK_PROJECT_PATH=/path/to/proj NDK_APPLICATION_MK=/path/to/Application.mk to build the project.

   • Note that change /path/to/proj to the path of this project, and /path/to/Application.mk to the absolute path of /Android_NFC_FIXED_UID/Application.mk.

5. If there is no error, you will get injecter and libuildctrl.so under /Android_NFC_FIXED_UID/libs, with 32-bit and 64-bit version.

6. Send two files to your android device under /data/local/tmp/.

7. Run /data/local/tmp/injector com.android.nfc /data/local/tmp/libuidctrl.so with root privilege.

   $ adb shell
   $ su
   $ /data/local/tmp/injector com.android.nfc /data/local/tmp/libuidctrl.so

Usage

Tested on TicWatch Pro 2020 with wearOS 2 (which is base on Android Pie).

UID will remain the same as long as NFC process doesn't restart.