How to know exactly the year of release of the Xiaomi phone: from serial number to hidden menus

Determining the year of release of a Xiaomi smartphone is a task faced when buying a used device, warranty repair or authentication. Production date affects battery life, availability of updates and even market value. Unfortunately, the manufacturer does not specify the year of release directly either in the settings or on the case, but there are several reliable ways to calculate it, from analyzing the serial number to hidden engineering menus.

In this article, we will discuss all the current methods for Redmi models, POCO, Mi and Black Shark, including those that work without access to a box or check, learn how to decrypt factory code, where to look for a date in system files, and why some methods can give inaccurate results.

Serial number: main key to the release date

The most universal method is the analysis of serial number (S/N), It's assigned to every device in the factory. Xiaomi has it. 11–15 It contains coded information about the model, the assembly site and the date:

• 📦 On a sticker under the battery (for models with a removable battery) or under the back cover.
• 📱 In settings: Settings → The phone. → General information → Serial number.
• 📄 On the box (near the barcode) or in the warranty card.
• 🔌 Through ADB-Adb shell getprop ro.serialno

Xiaomi serial numbers have several formats, but most often the date is encrypted in 4-6 characters (for example, 2007). = July 2020.The transcript depends on the year of issue:

Important: After 2020, Xiaomi began using more complex encryption algorithms, so for new models (Redmi Note 12, POCO X5) If the serial number is not decryptable, check it through the official Mi Verify service (it does not work for all regions).

⚠️ Note: Fake smartphones often have serial numbers that do not match any of Xiaomi's formats. S/N consists of a random set of letters or begins with 0000, 1111 — It's a sure sign of fake.

Date of production on the box and documentation

If you still have the original packaging, you can find the release date on a barcode sticker (usually at the end of the box).

• 📅 MFG DATE (Manufacturing Date – Direct Date in the format YYYY-MM-DD or MM/YYYY.
• 🏭 Made in China/India + code next to each other, for example, 202305 = may 2023.
• 🔢 S/N or IMEI — They can also be deciphered (see section). 1).

On Xiaomi boxes after 2021 The date is often given in the week format (for example, W25/2023 = 25-I'm a week. 2023 To get it back to normal, use online calculators of weeks (e.g. Epoch Converter).

POCO And Black Shark can use their own designations, like on boxes. POCO F5 date hidden in line PROD DATE bottom QR-If the sticker is erased or missing, check it out:

• 📄 Warranty card – the date of sale is usually 1-3 months after the date of production.
• 🛒 Check or electronic copy of the order (for devices purchased in official stores).

⚠️ Note: On fake boxes, the date is often misstated (e.g., 2026 for a model released in 2020) or duplicated on typo stickers!

3. Hidden engineering menus: date in system data

If the serial number is not readable and the box is not, the release date can be found in the service menu of the smartphone, which works on all Xiaomi models, but requires care - incorrect actions can lead to a system failure.

Instructions for most devices:

1. Open the phone app and enter the combination: ##4636##
2. In the Phone Information menu, find the lines Build Date or Build Date.
3. Alternative code for new models: ##284## (displays firmware date, which is usually 1-2 months newer than the production date).

On some devices (for example, Redmi Note 11 Pro)+) The date is hidden deeper:

• 🔧 Go to Settings → The phone. → Version. MIUI and tap 7 times on the kernel line (opens the Kernel Version menu with the compilation date).
• 📱 Use it. ADB-command: adb shell getprop ro.build.date.utc (will display timestamp that you need to convert to date via Epoch Converter).

Method limitations: The date on the engineering menu may indicate the firmware assembly date, rather than the device itself, the difference is usually 2-6 months.

Charge your phone at least 50 times%|Record the current settings (in case of failure)|Do not press the "Wipe" or "Reset" buttons"|Use only official codes-->

4. Verification of IMEI: Does this method work for Xiaomi?

Many users are trying to find out the release date through IMEI — However, for Xiaomi, this method does not work directly: unlike Samsung or Apple, the Chinese manufacturer does not encode the date in the device. IMEI. However, it can be obtained indirect information:

Steps to verify:

1. Find out. IMEI Your phone: In settings: About the phone → General information → IMEI. 06# On the sticker under the battery (for older models).
2. Check it out. IMEI And they're going to show you, on sites like IMEI.info or SNDeepInfo: 📅 Date of first activation (approximately 1-6 months after the date of production). 🏭 Producing country (e.g. China or India). 📱 Device model (for authentication).

Important: If your site shows that your Xiaomi is activated in 2026 and you bought it in 2023, this is a sign:

• 🔄 Interlaced device (IMEI could have been altered).
• 🚨 Fakes (IMEI not conforming to the model).
• 📦 A phone in a warehouse (rarely, but it happens).

5. Analysis of firmware version and updates

The phone release date is indirectly linked to the version MIUI And it's available updates, like if your Redmi 9 came out in 2020, but it's running on it. MIUI 14 (2023), that could mean:

• 🔄 The phone was updated by air (OTA).
• 🛠️ The device was re-flashed manually.
• 📦 The phone was in storage for a long time before the sale.

How to use this method:

1. Check out the current version of MIUI: Settings → About Phone → MIUI version.
2. Compare it to the official update list for your model.
3. Pay attention to the date of the first release for your version, MIUI 12.5. POCO X3 Pro was released in March 2021, which means that the phone was produced no later than this date.

You can also use update logs:

• 📱 Go to Settings. → The phone. → Updating the system → Journal of updates.
• 🔍 Find the very first update – its date roughly corresponds to the activation date of the device.

Example: If the first update in the magazine is dated 15.07.2022, and the model was released in 2021, the phone is likely produced in the first half of 2022.

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If the update log is empty, try resetting the system update app cache (Settings) → Annexes → Application management → Updating the system → Warehouse → Clear the cache).

6. Physical signs: how to determine the age of a phone without data

If no digital methods have helped, look for external signs that will indirectly indicate the age of the device:

Battery:

• 🔋 If the phone is less than 60% of the charge (for example, the Redmi Note 10 Pro with 5000 mAh discharges in 4-5 hours), it is likely to be 2.+ year-end.
• 📉 In settings: Settings → Battery → Battery condition (indicates wear in %) Wear >30% say they are 1.5 years old.

Body and equipment:

• 🔍 Old models (up to) 2019 years have micro-USB connector, new (2020+) — USB-C.
• 🎧 3.5 mm audio jack: the POCO Redmi and it disappeared after 2021 (except for Redmi Note) 11S).
• 📦 Charger: up to 2020 Xiaomi put in a box of the year 5V/2A charging, after — 18W/33W.

Camera and screen:

• 📸 Models up to 2018 have a resolution of the main camera 12-16 MP, after – 48-200 MP.
• 🖥️ Screens with a cutout (notch) – a sign of devices 2018-2020, “hole” (punch-hole) – 2020+.

Packaging: Until 2021, Xiaomi’s boxes were orange, followed by white or black (for the Mi series). IMEI They only appeared on the end in 2019.

⚠️ Warning: Fake smartphones often copy the design of new models, but use outdated components. 12 micro-USB and 13-MP camera — 100% fake.

7.Official Xiaomi Services: Authentication and Dates

If you doubt the authenticity of the device or want to get official data, use the services of Xiaomi:

1. Mi Verify (Authentication Verification):

• 🌐 Go to the checkout page.
• 🔢 Enter the serial number, IMEI sticker-code.
• 📅 The system will show the activation date (not production!) and the status of the warranty.

2. Mi Account (link to the account):

• 📱 If your phone is linked to your Mi Account, go to account.xiaomi.com → Devices.
• 🔍 This shows the date of the first binding (roughly corresponding to the date of sale).

Service centres:

• 📞 Contact the official service center with a serial number.
• 📄 Provide a check or warranty card to clarify the date.

Limitations: Xiaomi’s official services don’t always show an exact production date, especially for devices purchased from non-official stores (such as AliExpress or Amazon).

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If the activation date in Mi Verify is 1-2 years newer than the production date by serial number, the phone was in stock for a long time or was activated not immediately after purchase (for example, a gift).

FAQ: Frequent questions about Xiaomi release date