How I Bypassed App PIN Lock and Root Detection Using Hooking

In this blog, we will discuss how we can bypass pin lock and root detection in an app

Raj Prasad Kuiri

5 min read

·

Dec 27, 2025

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App Pin lock bypass

Case 1

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This app is validating the user by entering 4 digit number, which is 5555. Let's understand the passcode logic, how it's validating the user.

After analyzing the app via Jadax i came to know these classes are responsible. Let’s understand each of them thoroughly.

-> CreatePasscode.java - It generates a new passcode

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This code validates a 4-digit passcode, saves it locally, shows a success message, and navigates to the next screen.

-> UserAuthSave.java - It handles passcode storage

This function stores the user’s passcode in plaintext inside SharedPreferences and sets a flag…