Open File Manager And Complete Midiag.apk Installation. Then Try - Again

The error message "Open File Manager and complete midiag.apk installation. Then try again" a specific instruction common on Xiaomi (MIUI/HyperOS) devices when attempting to enable Diagnostic (Diag) Mode

. This process is typically used for advanced repairs, such as fixing IMEI issues or reading/writing QCN data. Step-by-Step Fix APK Installation Problems: Troubleshooting & Solutions

Title: That Annoying “Complete Action Using” Loop? Here’s How I Fixed It with MIDIAG.apk

Published: April 20, 2026

Reading time: 3 minutes

We’ve all been there. You’re in the zone, trying to sideload a crucial APK—maybe a diagnostic tool like midiag.apk—and your Android device just… refuses to cooperate. You tap the file. Nothing. Or worse, you get a cryptic error: “Can’t open file.”

Today, I spent 20 minutes chasing my tail before I remembered the oldest trick in the book: Open the file manager and complete the installation manually. The error message "Open File Manager and complete midiag

Let me walk you through what happened, and why “try again” actually worked.

How to Fix "Open File Manager and Complete midiag.apk Installation. Then Try Again" – A Complete Step-by-Step Guide

If you've encountered the error message "Open file manager and complete midiag.apk installation. Then try again," you're likely in the middle of installing a diagnostic tool, firmware update, or system repair utility on an Android device—often from brands like Xiaomi, Redmi, POCO, or Realme. This message can be frustrating because it interrupts the installation process without clearly explaining what went wrong.

In this comprehensive guide, we’ll break down exactly what this error means, why it appears, and how to resolve it by properly using your file manager to install the midiag.apk file. By the end, you’ll be able to proceed with your installation smoothly. Title: That Annoying “Complete Action Using” Loop

Why This Works

Android’s package manager sometimes loses track of a sideload if the installer activity is interrupted. By manually opening the file manager and invoking the installer directly, you bypass any broken intents or browser handlers. It’s the command-line equivalent of adb install midiag.apk—but without a PC.

Solution 1: The Manual Install Method (Most Common Fix)

The error is explicitly telling you to install the file, so let’s try to do exactly that. Sometimes the file exists in a temporary folder, but the system isn't opening the installer automatically.

Open your File Manager: Use the default "Files" or "File Manager" app on your phone.
Check the Download Folder: Navigate to your internal storage and look for the Download folder. Look for a file named midiag.apk.
Check the Root Directory: If it isn't in downloads, go back to the main Internal Storage screen. Look for loose .apk files sitting in the root directory.
Install it: If you find midiag.apk, tap on it. You may need to grant permission to "Install unknown apps" for your file manager.
Restart: Once installed, restart your phone and try whatever action caused the error originally.

Why Do You See "Open File Manager and Complete midiag.apk Installation. Then Try Again"?

This error typically arises due to one of the following reasons: Why This Works Android’s package manager sometimes loses

| Reason | Explanation | |--------|-------------| | Incomplete installation | The APK wasn’t fully installed during the automated process. | | Missing permissions | The file manager wasn’t granted permission to install unknown apps. | | Corrupted midiag.apk | The APK file is damaged or incomplete. | | Wrong file location | The installer expects the APK in a specific folder, but it’s elsewhere. | | Android version restrictions | Newer Android versions block installation from certain directories. |

The error is essentially the system telling you: “I can’t proceed until this diagnostic tool is manually installed. Use your file manager to do it.”