VRN on Xiaomi Redmi: hidden mode, which you did not know

What is VRN on Xiaomi Redmi smartphones and why is it needed?

If you own a Xiaomi Redmi smartphone and suddenly notice a mysterious acronym for VRN in your settings or logs, don’t panic. It’s not a virus or a bug, but a special internal mode that the manufacturer uses to test and debug devices. However, its activation can lead to unexpected consequences, from reduced performance to problems with connecting to mobile networks.

VRN (Verification Release Number) is a service identifier that is assigned to the firmware during the factory inspection stage. In normal smartphone operation, it should not be displayed to the user, but sometimes falls into public settings due to crashes or incorrect updates. Most often, VRNs are faced by owners of Redmi Note 10/11/12, Redmi 9/10 and POCO X3/X4 models, where this mode can be activated after manual reset or firmware via Fastboot.

Why does it matter? The thing is, VRN-The mode restricts certain functions of the device, simulating a "test stand"; for example, access to the device may be blocked. 5G-network (even if the module is supported), disconnect some of the sensors or appear artificial delays in the processor, while the appearance of the smartphone looks good, which complicates the diagnosis of the problem.

Signs of activation VRN-mode on your Redmi

How do you know if your Xiaomi Redmi has a VRN? Here are the key symptoms to watch out for:

• 📵 Mobile network problems: the phone suddenly stops catching 4G/5G, It was stable before, but it was in the settings. SIM-The card can be displayed with the message "Only emergency calls".
• ⚡ Performance decline: Games and applications are starting to slow down, even though the CPU load in Task Manager is minimal, due to artificially limiting the CPU clock speed.
• 🔧 Hidden menu items: Unknown sections appear in the settings (such as "Engineer Mode" or "Factory Test") that were not previously available.
• 📱 Unusual notifications: a message “Test Mode Active” periodically pops up in the notification curtain or "VRN: ON".

Importantly, these signs can also be seen in other malfunctions (such as modem damage or firmware failure) and to accurately diagnose VRN, you need to look at the engineering menu or check the system log, which we will discuss in the next section.

How to check if VRN is on on your smartphone

There are several ways to confirm activation. VRN-So let's start with the simplest one, with the standard settings:

1. Open the phone app and enter the combination: ##4636##
2. In the menu that appears, select "Phone Information".
3. Scroll down to the Software Info block – if there is a string “VRN:ON” or “Test Mode: Enabled”, the mode is active.

If the first method didn’t work, try the alternative method via ADB (you need a computer and USB debugging enabled):

adb shell getprop ro.vrn.status

If the command returns "1" or "enabled" the VRN is turned on. For Redmi models based on MediaTek (for example, Redmi 9A or Note 8 Pro), you can use the engineering menu:

1. Enter the dialer: ##36446337##
2. Go to the "Connectivity" section" → "Network Testing".
3. Check the status of "VRN Mode" - if it is different from "Disabled", the mode is active.

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If the engineering menu asks for a password, try the standard combinations for Xiaomi: 1234, 0000 or engineer.

Why? VRN-mode activates itself

In most cases, VRNs are turned on not by accident, but because of specific user actions or system failures.

• 🔄 Incorrect firmware update: if you installed custom firmware (for example, through TWRP) or interrupt the air renewal process (OTA), The service sections responsible for the work regimes may have been damaged.
• 🧹 Hard Reset: After a complete reset through Recovery, test mode flags are sometimes shot down, especially if the device has been repaired before.
• 🛠️ Repair or replacement of fees: if the service center changed the motherboard or modem, the master could forget to turn off VRN post-test.
• 📦 Factory marriage: rare, but it happens that the device leaves the conveyor with an already activated test mode (more often found in the "gray" batches).

Separately, it is worth mentioning Redmi models with Qualcomm Snapdragon processors (for example, Redmi Note 10 Pro or Qualcomm Snapdragon processors). POCO F3). They have VRN It can be activated when connected to diagnostic equipment through the port. EDL (If you have ever tried to unlock a bootloader or restored your phone through the Mi Flash Tool, you are at risk of activation. VRN rising.

How to disable VRN on Xiaomi Redmi: step-by-step instructions

If you've confirmed that VRN-It's active, it can be deactivated in a number of ways, and let's start with the safest one, through the engineering menu:

1. Enter ##36446337## (for MediaTek) or ##4636## (for Qualcomm).
2. Go to the "Network Testing" or "Phone Information" section.
3. Find the "VRN Mode" or "Test Mode" option and set the "Disabled" value.
4. Save the settings and restart the phone.

If the engineering menu is not available or does not help, try resetting the network settings:

1. Open the Settings. → SIM-maps and mobile networks.
2. Select "Reset Network Settings" (may require input) PIN-code).
3. After the reboot, check the VRN status again.

For advanced users, there is a radical method – editing the build.prop file through ADB:

adb shell


su




mount -o rw,remount /system




echo "ro.vrn.status=0" >> /system/build.prop




reboot

⚠️ Warning: Incorrect editing of build.prop can lead to loss of warranty or “bricking” of the device. Use this method only if you are confident in your actions!

Xiaomi Redmi models, the most exposed VRN-problem

Not all Xiaomi smartphones are equally prone to spontaneous activation of VRN. According to service centers and forums (for example, 4PDA or Mi Community), most often this problem is faced by owners of the following models:

Interestingly, Qualcomm devices are more likely to suffer from VRN after firmware manipulation, while MediaTek devices can turn on the mode even after a banal reset, due to the peculiarities of implementing test functions in chipsets.

If your model is in the table, you should be especially careful about updates and resets. For example, before you run through the Mi Flash Tool, always check the status of VRN in the logs (fastboot getvar all).

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On models with MediaTek (Redmi 9, Note 8), VRN is more often activated after a hardware reset, and on Qualcomm (Note 10, POCO X3) - after software manipulations.

What to do if the VRN does not turn off: radical measures

If the standard methods do not help, VRN-The regime is still ruining lives, and we're going to have to take more serious measures:

• 🔧 Fastboot Firmware: Download the official firmware for your model from Miui Download and run your phone through the Mi Flash Tool with complete erasure ("clean all data erasure").
• 📥 Update through OTA from a clean state: perform a reset to factory settings, then immediately check for updates in Settings → Update of the PO.
• 🛠️ Contacting the Service Center: If VRN appeared after repair, return the device under warranty - the master is obliged to fix the problem for free.

For Redmi models with unlocked bootloader, there is another way to install a customized recavator (TWRP) and manually remove the VRN flag through the file /data/property/persist.vrn.status. However, this method requires experience and can lead to data loss.

⚠️ Note: On some firmware (for example, MIUI 13/14 For the Redmi Note 11) VRN It can block the bootloader from unlocking, so you can first turn off the mode through the engineering menu, and then try to unlock the bootloader.

FAQ: Frequent questions about VRN on Xiaomi Redmi