If you've just unboxed a new Xiaomi, Redmi, or Poco device running the latest HyperOS based on Android 15, you might be on the hunt. You're an advanced user, a developer, or a power user looking for that magic "diag enable code." You're scouring forums, watching videos, and trying the old *#*#...#*#* combinations, but nothing works.
Here's the truth you need to hear: Your search is frustrating because a simple, new dialer code for the Qualcomm Diagnostic Mode on HyperOS and Android 15 likely doesn't exist.
*#*#663368378#*#*
*#*#68276278#*#*
*#*#663364636#*#*
*#*#73694364#*#*
*#*#717#*#*
*#*#686564#*#*
*#*#24744625#*#*
This isn't a bug. It's a feature. As HyperOS matures, Xiaomi is intentionally locking down low-level access to enhance system security and prevent inexperienced users from "bricking" their devices. The old, easy-access "engineering modes" are being systematically removed.
But don't worry. This guide explains everything. You'll learn:
What "Diag Mode" actually is (it's not what most people think). Why the old dialer codes no longer work. The new, more technical methods that are required to enable it. The significant risks you must understand before you proceed.
What is "Diag Mode"? (And Why Do You Really Want It?)
First, let's clear up a common misconception. Most users confuse the "CIT" (Factory Test Menu) with the "Diag Mode."
CIT / Factory Test Menu (*#*#6484#*#*): This is the simple menu you can access to test your screen, speaker, microphone, and other hardware. This is not "Diag Mode." Android Testing Menu (*#*#4636#*#*): This is the standard Android menu for checking network information, battery stats, and usage. This is also not "Diag Mode."
The "Diag Mode" you're likely looking for is the Qualcomm Diagnostic Mode, also known as the Qualcomm HS-USB QDLoader 9008 port.
This is a very low-level interface that is not intended for average users. It gives you (and specialized software) direct access to the phone's modem and EFS (Encrypting File System) partition.
Advanced users and repair shops seek this mode to:
Use professional tools like QPST and QXDM for modem-level logging. Manually lock or unlock network bands (a feature often removed from the MTK Engineering Mode in HyperOS). Perform backups of the EFS partition, which contains your device's unique IMEI number. Restore a "bricked" device that won't boot into fastboot or recovery. In some regions, perform IMEI repair (Warning: This is illegal in most countries and can void your warranty).
Because this mode is so powerful and dangerous, Xiaomi has understandably made it much harder to access on HyperOS and Android 15.
The Bad News: Why Old Dialer Codes Fail on HyperOS
Recent reports from users on forums like Reddit have confirmed this trend. With updates to HyperOS (especially those based on Android 14 and 15), well-known codes are being disabled.
For example, the popular MTK Engineering Mode code (*#*#3646633#*#*) on MediaTek-based Xiaomi phones, which allowed for band locking, is now disabled on most updated HyperOS ROMs.
Xiaomi is pushing users away from these "backdoors." This means any article or video claiming a "new simple code" is almost certainly clickbait. The solution is now more technical.
How to Actually Enable Diag Mode on HyperOS (The New Methods)
There are now two primary methods to enable the Qualcomm Diag Port on modern Xiaomi devices. Neither is as simple as a dialer code.
Method 1: The ADB & Root Method (Advanced Users Only)
This is the most reliable "free" method, but it has two major prerequisites: an Unlocked Bootloader and Root Access (typically with Magisk). If you don't know what these are, do not attempt this.
Prerequisites:
A PC with ADB and Fastboot drivers installed. Your Xiaomi device with an unlocked bootloader. (You can check out [our guide on how to safely unlock your Xiaomi bootloader].) Your device must be rooted with the latest version of Magisk. USB Debugging enabled in Developer Options.
Steps to Enable Diag Mode via ADB:
Connect your phone to your PC via a high-quality USB cable. Open a Command Prompt (CMD) or Terminal on your PC in your ADB folder. Type adb devices to ensure your device is recognized. Enter the ADB shell by typing: adb shell Request root privileges by typing: su (You will need to grant the permission on your phone's Magisk pop-up). Execute the command to set the USB configuration to diagnostic mode. T
his is the "new code" you've been looking for: setprop sys.usb.config diag,adb Verify on your PC: Open "Device Manager" on your Windows PC. If it worked, you will see your "COM & LPT" ports refresh. Under this, you should see a new device:
"Qualcomm HS-USB QDLoader 9008" or "Qualcomm HS-USB Diagnostics 901D"
To turn it off and return to the normal file transfer mode (MTP), simply type setprop sys.usb.config mtp,adb or reboot your phone.
Method 2: Third-Party Commercial Tools (The "Repair Shop" Method)
If your device isn't rooted or you're uncomfortable with the ADB method, the only other way is to use professional, paid software.
Tools like ChimeraTool or other advanced flashing boxes are designed for mobile repair shops. These tools often use their own software exploits or drivers to force a device into Diag Mode without needing root.
This method is:
Not free. These are subscription-based professional tools. Not guaranteed. Their effectiveness can vary by device model and HyperOS patch level. Still risky. Using them incorrectly can still cause damage to your device.
The Serious Risks: A Final Warning
We must be crystal clear: Enabling Diag Mode is extremely risky for 99% of users. You should not attempt it "just to see what happens."
You Can "Brick" Your Phone: A single wrong command or interruption while accessing the EFS partition can corrupt your IMEI. This renders your phone unable to connect to any cellular network—permanently. This is known as a "hard brick." You Will Void Your Warranty: The prerequisite for Method 1—unlocking the bootloader—instantly voids your device warranty in most regions.
You Expose Your Device: A phone with Diag Mode enabled is vulnerable to low-level attacks if connected to an untrusted computer. You Can Break the Law: As mentioned, in most countries (including the US, UK, and across the EU), tampering with, changing, or "repairing" an IMEI number is a serious crime.
Alternatives: What Are You Actually Trying to Do?
Before you attempt any of this, ask yourself why you need Diag Mode. There's probably a safer alternative.
If you want to test hardware…
Use the CIT Menu: Open your Dialer and type *#*#6484#*#*
If you want to check network info…
Use the Android Testing Menu: Open your Dialer and type *#*#4636#*#*. You can see network types, signal strength, and more.
If you want to unlock your bootloader…
You don't need Diag Mode for this. You need to use the official [Mi Unlock Tool] and follow the standard (and often long) waiting period.
If you want to flash a new ROM…
You only need an unlocked bootloader and Fastboot or TWRP recovery. Diag Mode is not involved. (Check out our [10 hidden HyperOS features you should actually use]).
Frequently Asked Questions (FAQ)
Q1: What is the new diag enable code for HyperOS Android 15? A: There is no new simple dialer code. Xiaomi has intentionally removed easy access to this mode for security. The "new" method for advanced, rooted users is an ADB command: setprop sys.usb.config diag,adb.
Q2: Is enabling diag mode safe? A: No. It is extremely risky for inexperienced users. You can permanently "brick" your phone by corrupting your EFS partition or IMEI. It also voids your warranty.
Q3: Does the *#*#4636#*#* code enable diag mode? A: No. This code opens the standard Android Testing Menu, which is used for viewing phone and network information. It is not the Qualcomm Diagnostic Mode.
Q4: Do I need to root my phone to enable diag mode? A: For the free, manual ADB method, yes, you need to be rooted. Some professional, paid, third-party repair tools may be able to enable it without root, but they are not intended for general consumers.
Conclusion: Stop Searching, Start Understanding
The hunt for a simple "HyperOS Android 15 diag enable code" ends here. The truth is, Xiaomi has locked down this advanced feature, and the easy "backdoor" is closed.
Accessing the Qualcomm Diagnostic Mode is no longer a party trick; it's a serious, high-risk procedure reserved for developers and repair professionals who are rooted or using paid tools.
For the vast majority of users, the safest and smartest move is to use the built-in, safe menus like the CIT and Android Testing menus. If you are an advanced user, the setprop ADB command is your new "code." Proceed with extreme caution.
[our guide on how to safely unlock your Xiaomi bootloader] [10 hidden HyperOS features you should actually use]
Comment what issue your facing with your redmi hyperOS android 15 also share to all social media, Enjoy.
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