How to Enable Or Disable Diag Mode on Qualcomm device using ADB [Works on Vivo, Xiaomi, Oppo and more]

If you want to write or repair IMEI or change the IMEI number of any Qualcomm Snapdragon chipset powered smartphones, then this guide is for you. Now, we assume that you’re reading this article that means you want to repair IMEI of any Qualcomm device. But in order to do this, you will have to enable Diag Mode on your device at first via dialing or putting ADB commands. Here in this article, we will share How to Enable Or Disable Diag Mode on Qualcomm device using ADB. This method works on Vivo, Xiaomi, Oppo and more devices.

Diag port is a Diagnostic Mode to test out the different working process of hardware and software on a Qualcomm device. Some tools required to enable Diag connection in order to fix null/invalid IMEI or flash QCN file or EFS file as well. This guide will explain how to enable Diagnostic Mode (Diag Mode) on an Android phone which runs on a Qualcomm processor.

What is the Diag Mode?

You should know that the Diag port must be enabled on Qualcomm smartphones in order to write or repair IMEI number. Once you have enabled the diag port on your Qualcomm device, you will be able to repair or change IMEI number of your device via QPST tool, QFIL tool, or others easily.

It’s worth mentioning that for any MediaTek (MTK) chipset powered devices, Miracle Box tool is required to repair IMEI number easily. Whereas, Diag COM Port is not required for MediaTek devices and other processors like Spreadtrum, etc. But if you’re going to repair IMEI on any Qualcomm devices like Vivo, Oppo, Xiaomi, Samsung, Nokia, Lenovo, and Motorola then diag port is necessary.