How to know exactly the year of the release of Xiaomi phone: from the box to the hidden menu

Buying a Xiaomi smartphone in the secondary market is always risky: the seller can hide the real age of the device, and the appearance rarely gives the true release date. Meanwhile, the year of production directly affects the residual battery life, compatibility with new versions of MIUI and even the market value of the gadget. For example, the Redmi Note 10 Pro, released in early 2021, can last 15-20% longer than the model of the same name, but assembled in late 2022 due to the degradation of lithium-ion batteries.

In this article, we will discuss 7 working ways to determine the year of release of a Xiaomi phone - from the obvious (date on the box) to the hidden (analysis of the serial number through the engineering menu). IMEI It's not always clear how to detect a fake box or what to do if the serial number is erased, POCO and Black Shark.

1.Date check on the original box

The easiest way to do this is to look at the phone’s packaging. On the back of the Xiaomi box (near the barcode), there is always a YYYY-MM-DD or MM/YYYY production date, for example, a 2023.05 sign that the device rolled off the assembly line in May 2023.

But there are pitfalls here:

• 🔍 Fraudsters often fake packaging, especially for popular models like the Redmi Note 12 or Xiaomi 13T. Check the quality of the print, fonts and hologram – on the original they are clear, without blurring.
• 📦 Repackaging: If the phone was repaired in an unofficial service, the box could be replaced with a universal (no date).
• 🔄 Difference Between Dates: The date on the box may not match the activation date of the phone (for example, if the device was in stock).

⚠️ Note: If the date is in the box in the format WYYWW (for example, W2335), This is not the year of release, but the week and year of production according to the Xiaomi standard. Here 23 - 2023, 35 - 35 weeks (late August).

To rule out counterfeiting, check the serial number on the box with the number in the phone settings (Settings → About Phone → General Information).

2. Analysis of the serial number (S/N)

The serial number (S/N) is a unique device identifier that contains encrypted information about the production date. Xiaomi has an S/N format that varies depending on the year and model, but the structure is most often used:

ABCD1234567890


where:




- AB - factory code




CD: year of release (e.g. 21 = 2021)




- 1234567890 - unique number

How to decipher:

1. Go to Settings → About Phone → General Information → Serial Number.
2. Write down the first 4 characters. For example, for K6T2105...: K6T is the model/factory code. 21 is the year of release (2021).

K6T1...

2011

2021

IMEI

Exceptions:

• 📱 Models. POCO (for example, POCO X3 Pro may use format YYYYWW, where WW — week-end.
• 🔧 Devices released before 2018 often have non-standard encoding. IMEI.

3. Verification through IMEI: Myths and Reality

Many sources claim that IMEI is the only way to know the date of the phone’s release, and this is partly true only for devices released before 2019. Xiaomi’s current smartphones (starting with the Mi 9 and Redmi Note 8) use IMEI without reference to the date of production.

Method 1: Online services

Use trusted platforms like IMEI.info or SNDeepInfo, which analyze the database and can show an approximate activation date (not production!) with an accuracy of about 70%.

Method 2: Engineering menu

1. Enter the code in the phone app: ##4636##.
2. Go to the tab Information about the phone.
3. Find the production date or Manufacture Date line (if any).

⚠️ Note: On some models (e.g, POCO F3) The engineering menu may not display the date of production. ADB-Team: Adb shell getprop ro.boot.ddr_info In the answer, look for the line with manufacture_date.

Hidden System Data: Where to Look?

There are a few menus hidden in MIUI firmware that can display the production date, and these methods don't work on all models, but it's worth trying:

Method 1: Test menu

1. Enter ##284## (for battery test)
2. Scroll down to the Manufacture Info section.
3. Look for MF DATE or PRODUCE DATE.

Method 2: build.prop file

This requires root access or ADB:

adb shell cat /system/build.prop | grep ro.build.date

The answer will be ro.build.date=Mon Oct 10 14:23:45 CST 2022, which is the firmware assembly date, which is usually close to the device’s production date.

Enter the code ##4636##

Check the tab "Phone Information"

Try the #284## code for the battery test

Use ADB if your phone is rooted

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Determination of the year by model and specifications

If none of the above methods worked, you can use the Xiaomi database. Each model has a unique code (for example, the M2007J22C for the Redmi Note 9 Pro), which can determine the year of release:

How to find the model code:

1. Go to Settings → About the phone → Model.
2. Copy the full name (e.g. 2201116TI for Xiaomi 12 Pro).
3. Enter it in the search engine with the words release date.

Examples of decryption:

• 📅 M2003J15SC → Redmi Note 9, released in May 2020.
• 📅 21091116C → Xiaomi 11T Pro, released in September 2021.
• 📅 22101316C → Xiaomi 12T, released in October 2022.

Please note: the model release date and the production date of a particular device may vary by 2-6 months (depending on the batch).

💡

If the model name has YYMM numbers (e.g. 21091116C), then 21 is 2021 and 09 is September, making it easier to determine the age of the device.

6. Check through official Xiaomi services

Xiaomi provides two official methods of authentication and release date of the device:

Method 1: Authentication Site

1. Go to the checkout page.
2. Enter IMEI or S/N.
3. The system will show the status of the warranty and the date of activation (not production!).

Method 2: Appendix Mi Verify

Download the official Mi Verify app from Google Play or AppGallery, which scans IMEI and gives you model information, first activation date and warranty status. Minus: only works for officially activated devices (not for "gray" imports).

⚠️ Note: If you see a message on the official website saying “This device has been activated” without a date, it may mean that the phone was activated before 2018 or its data did not get into the Xiaomi database (for example, when buying from unofficial stores).

7. Indirect signs: how to determine the age without data

If none of the methods worked, pay attention to indirect signs that will help estimate the age of the device:

Battery

• 🔋 Check the battery wear in Settings → Battery status: If the capacity has dropped below 85%, the device is likely to have 2.+ year-end.
• 📊 Use applications like AccuBattery to analyze charging cycles. More than 500 cycles are a sign of age 1.5-2 years.

Firmware and updates

• 🔄 Devices older than 3 years often don’t get new versions MIUI. Check the latest update in Settings → The phone. → Updating the system.
• 📱 Models from 2019 to 2020 (e.g. Mi 9, Redmi Note 8) are not usually supported MIUI 14.

Appearances

• 🔍 Erase of inscriptions: Older devices often erase the inscriptions on the back (for example, the Xiaomi logo or markings). CE).
• 🎨 Case color: Some colors were released for a limited time, for example, the Redmi Note 10 Pro in Onxy Gray color was only produced in 2021.

💡

If the phone was purchased in 2023 but the latest firmware update is from 2021, it’s a clear sign that the production date is incorrect or the device has been in stock for a long time.

FAQ: Frequent questions about Xiaomi release date