Fix TWRP Error 1 Easily: Step-by-Step Guide for 2025

Let me guess, you tried to root your phone but got a red line of code saying you have encountered something called an “error 1”? No need to panic, it’s a surprisingly common error called the Magisk Error 1 (or TWRP error 1), occurring when you flash the latest Magisk.zip file within your phone’s TWRP Recovery.

And it is quite simple to solve. 

In this post, you’ll learn how to solve this Magisk 1 error or TWRP error 1 and install your desired custom ROM or kernel. So without further ado, let’s get straight into the process. It’ll involve Magisk, TRWP and many other fun tools.

What is Magisk?

Magisk is an alternate application to tools like Supersu. The primary task of Magisk is to grant or deny root permission as per your need. Another feature of Magisk is it allows you to run apps that normally don’t run on a rooted device like Pokémon Go, banking apps, etc. 

Is Magisk safe? Well, Magisk was developed by an XDA developer, ‘topjohnwu’. It offers a Universal Systemless Interface (USI) which lets the user create their own mod app easily. Magisk’s working strategy is almost similar to the Xposed framework, which allows users to install various modules and tweak their Android devices.

What is Magisk Error 1 or TWRP Error 1?

Error 1, also known as Magisk install error 1, or twrp error 1 occurs when you try to flash an incomplete zip file. You may see error messages like “magisk updater process ended with error 1” on your screen.

A case of an incomplete zip file can happen due to either of the following reason:

1. Errors while downloading
2. Downloading a zip file – often the magisk.zip file – that was uploaded incorrectly or was incomplete.

How to Fix TWRP Error 1 (2 Methods)

You can try any of the following 2 methods to solve this issue if your updater process ended with error 1:

• TWRP RECOVERY 
• FLASHIFY APP

Method 1: Using TWRP Recovery

TWRP (Team Win Recovery Project) is one of the best custom recoveries for Android devices. It allows you to flash ROMs, kernels, and other modifications safely. One of its protective features prevents the flashing of an incompatible ROM, which may result in “Error 7.” However, “Error 1” occurs due to issues with the boot image.

To fix it, follow these steps:

Step 1: Extract the Boot Image (boot.img)

1. Download the custom ROM zip file that you were trying to flash.
2. Extract the boot.img file from the zip file using WinRAR, 7-Zip, or any file extraction tool.
3. Copy the extracted boot.img file to your phone’s internal storage or an external SD card.

Step 2: Boot into TWRP Recovery

1. Power off your phone.
2. Boot into TWRP recovery mode by pressing the correct key combination for your device (usually Power + Volume Up/Down).
3. Alternatively, use ADB Command:
   adb reboot recovery

Step 3: Flash the Boot Image

1. In TWRP, tap Install.
2. Tap Install Image (located at the bottom right corner).
3. Navigate to the folder where you saved the boot.img file.
4. Select boot.img.
5. Choose Boot Partition when prompted.
6. Swipe to confirm the flash.

Step 4: Reboot Your Device

1. Once the flashing process is complete, go back to the Main Menu.
2. Tap Reboot > System.

That’s it! Your device should now boot without encountering TWRP Error 1.

Method 2: Using Flashify App

If you’re not comfortable using TWRP recovery or prefer a simpler method, you can use the Flashify App. This method allows you to flash the boot image without using recovery mode.

Step 1: Extract the Boot Image (boot.img)

1. Download the ROM zip file and extract boot.img (as explained in Method 1, Step 1).
2. Move the extracted boot.img file to a convenient folder on your phone.

Step 2: Install and Set Up Flashify

1. Download Flashify from the Google Play Store.
2. Open Flashify and grant root permissions when prompted.

Step 3: Flash the Boot Image

1. In Flashify, tap on Boot image.
2. Navigate to the folder where you saved the boot.img file.
3. Select boot.img and confirm the flash.

Step 4: Reboot Your Device

1. Once the flashing process is complete, restart your device.
2. Your device should now boot up without TWRP Error 1.

With this method, you’ve also successfully rooted your device and fixed the Magisk Error 1!

For a detailed visual guide, you can watch the video below on how to fix TWRP Error 1 and root your device:

Bottomline

These 2 methods are foolproof ways to solve Magisk error 1 or the Magisk install error without too many complicated steps. You can learn more about a few other problems while flashing a custom ROM here. 

Now you can do anything you want on your phone as you have successfully installed Magisk on your Android device. Your phone is now rooted! But be aware of what ROMs you flash  or apps you install on your phone. Many viruses and spam files are masked as legitimate files or apps and look almost exactly like authentic files. To avoid this always use community-verified and trusted content sources like XDA.