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How to Enable DIAG Mode in OnePlus when *#801# is not working

In this guide, we will list out the steps to enable DIAG Mode in OnePlus when the code *#801# is not working. The devices from the Chinese OEM behold a slew of nifty codes under the hood. Some of the noteworthy ones include the ability to view Firmware Version, access Engineer Mode, factory reset the device, Make Anonymous Calls, and a plethora of other carrier-related codes.

Moreover, if you are into custom development, then you might have come across the DIAG Mode as well. Short form for Diagnostic Mode, it is used for carrying out some technical tweaks such as enabling “Full-port Switch” to activate WifiCalling/VoLTE with the PDC Tool. Likewise, this mode is also used for restoring the original IMEI or writing a new one onto your device. So how could you access this mode?

Earlier, you only needed to type in *#801# in the dialer and the DIAG Mode will be right in front of you. However, the OEM recently pushed an update that blocked the DIAG Mode from being accessed via the *#801# code. So how could you then access this mode? Well, there exists a nifty workaround through which you could easily bypass this restriction and enable the DIAG Mode on your OnePlus device. Without further ado, let’s check it out.

How to Enable DIAG Mode in OnePlus when *#801# is not working

Enable DIAG Mode in OnePlus

  1. To begin with, download the OnePlus Diagnostic App from APKMirror
  2. Then open it and proceed with the on-screen instructions to install it.Enable DIAG Mode in OnePlus
  3. The app will be installed but would be hidden from the app drawer.
  4. So download and install the Quick Shortcut Maker app from the Play Store.
  5. Now double click in an empty location on your home screen and select Widgets.Enable DIAG Mode in OnePlus
  6. Scroll to Quick Shortcut Maker and drag and drop it to the home screen.
  7. It will now launch the app. Scroll to Diagnose, and tap on it to further expand it.
  8. Then tap on the Diagnose activity of your choice and hit Create.Enable DIAG Mode in OnePlus

    If you are unsure, then read the activity name below the shortcut name. For example, I’m planning to carry out the LCD screen test, so I will opt for com.oneplus.health.categories.screen.LCDCheckActivity.

  9. The widget will now be created on the home screen. Tap it to open and you may then start off with the test.Enable DIAG Mode in OnePlus

That’s it. These were the steps to enable DIAG Mode in OnePlus when the code *#801# is not working. If you have any queries concerning the aforementioned steps, do let us know in the comments. We will get back to you with a solution at the earliest.


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